diff --git a/book/book_first_edition.pdf b/book/book_first_edition.pdf
deleted file mode 100644
index 49bc67f..0000000
Binary files a/book/book_first_edition.pdf and /dev/null differ
diff --git a/book/book_second_edition.pdf b/book/book_second_edition.pdf
index ff90f0d..fcc036c 100644
Binary files a/book/book_second_edition.pdf and b/book/book_second_edition.pdf differ
diff --git a/src/builtin_structures/arrays_and_strings/reverse_words.py b/src/builtin_structures/arrays_and_strings/reverse_words.py
deleted file mode 100644
index 0055cec..0000000
--- a/src/builtin_structures/arrays_and_strings/reverse_words.py
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/usr/bin/python3
-
-# Mari von Steinkirch @ 2013
-# mari.wahl9@gmail.com
-
-# Bernardo Sulzbach (mafagafo) @ 2014
-# 1449441@gmail.com
-
-
-def reverse_words(string):
-    """
-    Reverse the order of the words in a sentence.
-    :param string: the string which words wil lbe reversed.
-    :return: the reversed string.
-    """
-    l1 = string.split(' ')
-    l1.reverse()
-    return ' '.join(l1)
-
-
-def reverse_words_brute(string):
-    """
-    Reverse the order of the words in a sentence.
-    :param string: the string which words wil lbe reversed.
-    :return: the reversed string.
-    """
-    word, sentence = [], []
-    for character in string:
-        if character != ' ':
-            word.append(character)
-        else:
-            # So we do not keep multiple whitespaces. An empty list evaluates to False.
-            if word:
-                sentence.append(''.join(word))
-            word = []
-    # So we do not keep multiple whitespaces. An empty list evaluates to False.
-    if word != '':
-        sentence.append(''.join(word))
-    sentence.reverse()
-    return ' '.join(sentence)
-
-if __name__ == '__main__':
-    phrase = 'I love  Google,   Fedora  & Python!'
-    print(reverse_words(phrase))
-    print(reverse_words_brute(phrase))
diff --git a/src/builtin_structures/strings/__init__.py b/src/builtin_structures/strings/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/builtin_structures/strings/reversing_words_setence.py b/src/builtin_structures/strings/reversing_words_setence.py
deleted file mode 100644
index cb392c1..0000000
--- a/src/builtin_structures/strings/reversing_words_setence.py
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/python3
-# mari von steinkirch @2013
-# steinkirch at gmail
-
-
-def reversing_words_setence(str1):
-    ''' reverse the words in a sentence'''
-    words = str1.split()
-    rev_set = " ".join(reversed(words))
-    return rev_set
-
-
-def test_reversing_words_setence(module_name='this module'):
-    str1 = "Buffy is a Vampire Slayer"
-    assert(reversing_words_setence(str1) == "Slayer Vampire a is Buffy")
-        
-    s = 'Tests in {name} have {con}!'
-    print(s.format(name=module_name, con='passed'))
-
-
-if __name__ == '__main__':
-    test_reversing_words_setence()
-
diff --git a/src/builtin_structures/dicts/Counter_example.py b/src/neat_builtin_examples/dicts/Counter_example.py
similarity index 100%
rename from src/builtin_structures/dicts/Counter_example.py
rename to src/neat_builtin_examples/dicts/Counter_example.py
diff --git a/src/builtin_structures/dicts/OrderedDict_example.py b/src/neat_builtin_examples/dicts/OrderedDict_example.py
similarity index 100%
rename from src/builtin_structures/dicts/OrderedDict_example.py
rename to src/neat_builtin_examples/dicts/OrderedDict_example.py
diff --git a/src/builtin_structures/dicts/__init__.py b/src/neat_builtin_examples/dicts/__init__.py
similarity index 100%
rename from src/builtin_structures/dicts/__init__.py
rename to src/neat_builtin_examples/dicts/__init__.py
diff --git a/src/builtin_structures/dicts/count_unique_words_.py b/src/neat_builtin_examples/dicts/count_unique_words_.py
similarity index 100%
rename from src/builtin_structures/dicts/count_unique_words_.py
rename to src/neat_builtin_examples/dicts/count_unique_words_.py
diff --git a/src/builtin_structures/dicts/defaultdict_example.py b/src/neat_builtin_examples/dicts/defaultdict_example.py
similarity index 100%
rename from src/builtin_structures/dicts/defaultdict_example.py
rename to src/neat_builtin_examples/dicts/defaultdict_example.py
diff --git a/src/builtin_structures/dicts/delete_duplicate_char_str.py b/src/neat_builtin_examples/dicts/delete_duplicate_char_str.py
similarity index 100%
rename from src/builtin_structures/dicts/delete_duplicate_char_str.py
rename to src/neat_builtin_examples/dicts/delete_duplicate_char_str.py
diff --git a/src/builtin_structures/dicts/find_anagram_hash_function.py b/src/neat_builtin_examples/dicts/find_anagram_hash_function.py
similarity index 100%
rename from src/builtin_structures/dicts/find_anagram_hash_function.py
rename to src/neat_builtin_examples/dicts/find_anagram_hash_function.py
diff --git a/src/builtin_structures/dicts/find_dice_probabilities.py b/src/neat_builtin_examples/dicts/find_dice_probabilities.py
similarity index 100%
rename from src/builtin_structures/dicts/find_dice_probabilities.py
rename to src/neat_builtin_examples/dicts/find_dice_probabilities.py
diff --git a/src/builtin_structures/dicts/find_top_N_recurring_words.py b/src/neat_builtin_examples/dicts/find_top_N_recurring_words.py
similarity index 100%
rename from src/builtin_structures/dicts/find_top_N_recurring_words.py
rename to src/neat_builtin_examples/dicts/find_top_N_recurring_words.py
diff --git a/src/builtin_structures/dicts/runtime_dicts_with_timeit_module.py b/src/neat_builtin_examples/dicts/runtime_dicts_with_timeit_module.py
similarity index 100%
rename from src/builtin_structures/dicts/runtime_dicts_with_timeit_module.py
rename to src/neat_builtin_examples/dicts/runtime_dicts_with_timeit_module.py
diff --git a/src/builtin_structures/dicts/setdeault_example.py b/src/neat_builtin_examples/dicts/setdeault_example.py
similarity index 100%
rename from src/builtin_structures/dicts/setdeault_example.py
rename to src/neat_builtin_examples/dicts/setdeault_example.py
diff --git a/src/builtin_structures/dicts/veirfy_two_strings_are_anagrams.py b/src/neat_builtin_examples/dicts/veirfy_two_strings_are_anagrams.py
similarity index 100%
rename from src/builtin_structures/dicts/veirfy_two_strings_are_anagrams.py
rename to src/neat_builtin_examples/dicts/veirfy_two_strings_are_anagrams.py
diff --git a/src/builtin_structures/lists/__init__.py b/src/neat_builtin_examples/lists_and_strings/__init__.py
similarity index 100%
rename from src/builtin_structures/lists/__init__.py
rename to src/neat_builtin_examples/lists_and_strings/__init__.py
diff --git a/src/builtin_structures/arrays_and_strings/comb_str.py b/src/neat_builtin_examples/lists_and_strings/comb_str.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/comb_str.py
rename to src/neat_builtin_examples/lists_and_strings/comb_str.py
diff --git a/src/builtin_structures/arrays_and_strings/conv_str2int.py b/src/neat_builtin_examples/lists_and_strings/conv_str2int.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/conv_str2int.py
rename to src/neat_builtin_examples/lists_and_strings/conv_str2int.py
diff --git a/src/builtin_structures/strings/count_unique_words.py b/src/neat_builtin_examples/lists_and_strings/count_unique_words.py
similarity index 100%
rename from src/builtin_structures/strings/count_unique_words.py
rename to src/neat_builtin_examples/lists_and_strings/count_unique_words.py
diff --git a/src/builtin_structures/arrays_and_strings/find_0_MxN_replace_cols_rows.py b/src/neat_builtin_examples/lists_and_strings/find_0_MxN_replace_cols_rows.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/find_0_MxN_replace_cols_rows.py
rename to src/neat_builtin_examples/lists_and_strings/find_0_MxN_replace_cols_rows.py
diff --git a/src/builtin_structures/strings/find_all_permutations_string.py b/src/neat_builtin_examples/lists_and_strings/find_all_permutations_string.py
similarity index 100%
rename from src/builtin_structures/strings/find_all_permutations_string.py
rename to src/neat_builtin_examples/lists_and_strings/find_all_permutations_string.py
diff --git a/src/builtin_structures/lists/find_closest_num_seq.py b/src/neat_builtin_examples/lists_and_strings/find_closest_num_seq.py
similarity index 100%
rename from src/builtin_structures/lists/find_closest_num_seq.py
rename to src/neat_builtin_examples/lists_and_strings/find_closest_num_seq.py
diff --git a/src/builtin_structures/lists/find_duplicate_num_array.py b/src/neat_builtin_examples/lists_and_strings/find_duplicate_num_array.py
similarity index 100%
rename from src/builtin_structures/lists/find_duplicate_num_array.py
rename to src/neat_builtin_examples/lists_and_strings/find_duplicate_num_array.py
diff --git a/src/builtin_structures/strings/find_edit_distance.py b/src/neat_builtin_examples/lists_and_strings/find_edit_distance.py
similarity index 100%
rename from src/builtin_structures/strings/find_edit_distance.py
rename to src/neat_builtin_examples/lists_and_strings/find_edit_distance.py
diff --git a/src/builtin_structures/arrays_and_strings/find_first_non_repetead_char.py b/src/neat_builtin_examples/lists_and_strings/find_first_non_repetead_char.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/find_first_non_repetead_char.py
rename to src/neat_builtin_examples/lists_and_strings/find_first_non_repetead_char.py
diff --git a/src/builtin_structures/arrays_and_strings/find_if_is_substr.py b/src/neat_builtin_examples/lists_and_strings/find_if_is_substr.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/find_if_is_substr.py
rename to src/neat_builtin_examples/lists_and_strings/find_if_is_substr.py
diff --git a/src/builtin_structures/arrays_and_strings/find_if_only_unique_chars.py b/src/neat_builtin_examples/lists_and_strings/find_if_only_unique_chars.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/find_if_only_unique_chars.py
rename to src/neat_builtin_examples/lists_and_strings/find_if_only_unique_chars.py
diff --git a/src/builtin_structures/lists/find_long_con_inc_subseq.py b/src/neat_builtin_examples/lists_and_strings/find_long_con_inc_subseq.py
similarity index 100%
rename from src/builtin_structures/lists/find_long_con_inc_subseq.py
rename to src/neat_builtin_examples/lists_and_strings/find_long_con_inc_subseq.py
diff --git a/src/builtin_structures/lists/find_majority_in_seq.py b/src/neat_builtin_examples/lists_and_strings/find_majority_in_seq.py
similarity index 100%
rename from src/builtin_structures/lists/find_majority_in_seq.py
rename to src/neat_builtin_examples/lists_and_strings/find_majority_in_seq.py
diff --git a/src/builtin_structures/lists/find_max_profit.py b/src/neat_builtin_examples/lists_and_strings/find_max_profit.py
similarity index 100%
rename from src/builtin_structures/lists/find_max_profit.py
rename to src/neat_builtin_examples/lists_and_strings/find_max_profit.py
diff --git a/src/builtin_structures/lists/find_max_subarray.py b/src/neat_builtin_examples/lists_and_strings/find_max_subarray.py
similarity index 100%
rename from src/builtin_structures/lists/find_max_subarray.py
rename to src/neat_builtin_examples/lists_and_strings/find_max_subarray.py
diff --git a/src/builtin_structures/strings/find_palindrome_rec.py b/src/neat_builtin_examples/lists_and_strings/find_palindrome_rec.py
similarity index 100%
rename from src/builtin_structures/strings/find_palindrome_rec.py
rename to src/neat_builtin_examples/lists_and_strings/find_palindrome_rec.py
diff --git a/src/builtin_structures/lists/find_product_without_division.py b/src/neat_builtin_examples/lists_and_strings/find_product_without_division.py
similarity index 100%
rename from src/builtin_structures/lists/find_product_without_division.py
rename to src/neat_builtin_examples/lists_and_strings/find_product_without_division.py
diff --git a/src/builtin_structures/strings/find_subst_in_str.py b/src/neat_builtin_examples/lists_and_strings/find_subst_in_str.py
similarity index 100%
rename from src/builtin_structures/strings/find_subst_in_str.py
rename to src/neat_builtin_examples/lists_and_strings/find_subst_in_str.py
diff --git a/src/builtin_structures/lists/find_two_missing_numbers_in_sequence.py b/src/neat_builtin_examples/lists_and_strings/find_two_missing_numbers_in_sequence.py
similarity index 100%
rename from src/builtin_structures/lists/find_two_missing_numbers_in_sequence.py
rename to src/neat_builtin_examples/lists_and_strings/find_two_missing_numbers_in_sequence.py
diff --git a/src/builtin_structures/lists/greatest_sum_sub_array.py b/src/neat_builtin_examples/lists_and_strings/greatest_sum_sub_array.py
similarity index 100%
rename from src/builtin_structures/lists/greatest_sum_sub_array.py
rename to src/neat_builtin_examples/lists_and_strings/greatest_sum_sub_array.py
diff --git a/src/builtin_structures/strings/longest_common_substring.py b/src/neat_builtin_examples/lists_and_strings/longest_common_substring.py
similarity index 100%
rename from src/builtin_structures/strings/longest_common_substring.py
rename to src/neat_builtin_examples/lists_and_strings/longest_common_substring.py
diff --git a/src/builtin_structures/lists/merge_two_sorted_arrays.py b/src/neat_builtin_examples/lists_and_strings/merge_two_sorted_arrays.py
similarity index 100%
rename from src/builtin_structures/lists/merge_two_sorted_arrays.py
rename to src/neat_builtin_examples/lists_and_strings/merge_two_sorted_arrays.py
diff --git a/src/builtin_structures/arrays_and_strings/perm_str.py b/src/neat_builtin_examples/lists_and_strings/perm_str.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/perm_str.py
rename to src/neat_builtin_examples/lists_and_strings/perm_str.py
diff --git a/src/builtin_structures/lists/print_all_seq_with_cont_num.py b/src/neat_builtin_examples/lists_and_strings/print_all_seq_with_cont_num.py
similarity index 100%
rename from src/builtin_structures/lists/print_all_seq_with_cont_num.py
rename to src/neat_builtin_examples/lists_and_strings/print_all_seq_with_cont_num.py
diff --git a/src/builtin_structures/arrays_and_strings/remove_specified_char_from_str.py b/src/neat_builtin_examples/lists_and_strings/remove_specified_char_from_str.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/remove_specified_char_from_str.py
rename to src/neat_builtin_examples/lists_and_strings/remove_specified_char_from_str.py
diff --git a/src/builtin_structures/lists/removing_duplicates_seq.py b/src/neat_builtin_examples/lists_and_strings/removing_duplicates_seq.py
similarity index 100%
rename from src/builtin_structures/lists/removing_duplicates_seq.py
rename to src/neat_builtin_examples/lists_and_strings/removing_duplicates_seq.py
diff --git a/src/builtin_structures/arrays_and_strings/reverse_str.py b/src/neat_builtin_examples/lists_and_strings/reverse_str.py
similarity index 90%
rename from src/builtin_structures/arrays_and_strings/reverse_str.py
rename to src/neat_builtin_examples/lists_and_strings/reverse_str.py
index e14ad79..5752173 100644
--- a/src/builtin_structures/arrays_and_strings/reverse_str.py
+++ b/src/neat_builtin_examples/lists_and_strings/reverse_str.py
@@ -1,12 +1,8 @@
-#!/usr/bin/python3
+#!/usr/bin/env python
 
-#  Mari von Steinkirch @ 2013
-# mari.wahl9@gmail.com
+author = "Mari Wahl"
+email = "marina.w4hl@gmail.com"
 
-# Bernardo Sulzbach (mafagafo) @ 2014
-# 1449441@gmail.com
-
-# This file defines and compares four different functions that reverse a string.
 
 # timeit is used for benchmarking.
 from timeit import timeit
diff --git a/src/builtin_structures/strings/reverse_string_inplace_rec.py b/src/neat_builtin_examples/lists_and_strings/reverse_string_inplace_rec.py
similarity index 85%
rename from src/builtin_structures/strings/reverse_string_inplace_rec.py
rename to src/neat_builtin_examples/lists_and_strings/reverse_string_inplace_rec.py
index 3157a50..f2f164d 100644
--- a/src/builtin_structures/strings/reverse_string_inplace_rec.py
+++ b/src/neat_builtin_examples/lists_and_strings/reverse_string_inplace_rec.py
@@ -1,6 +1,8 @@
-#!/usr/bin/python3
-# mari von steinkirch @2013
-# steinkirch at gmail
+#!/usr/bin/env python
+
+author = "Mari Wahl"
+email = "marina.w4hl@gmail.com"
+
 
 
 def reverse_string_inplace_rec(s):
@@ -8,14 +10,14 @@ def reverse_string_inplace_rec(s):
     if s:
         s = s[-1] + reverse_string_inplace_rec(s[:-1])
     return s
-    
+
 def reverse_string_inplace(s):
     s = s[::-1]
-    if s[0] == '\0': 
+    if s[0] == '\0':
         s = s[1:]
         s += '\0'
     return s
-        
+
 
 
 def test_reverse_string_inplace_rec(module_name='this module'):
@@ -24,7 +26,7 @@ def test_reverse_string_inplace_rec(module_name='this module'):
     assert(reverse_string_inplace(s) == 'olleh')
     assert(reverse_string_inplace(s2) == 'yffub\0')
     assert(reverse_string_inplace_rec(s) == 'olleh')
-        
+
     s = 'Tests in {name} have {con}!'
     print(s.format(name=module_name, con='passed'))
 
diff --git a/src/neat_builtin_examples/lists_and_strings/reverse_words_sentence.py b/src/neat_builtin_examples/lists_and_strings/reverse_words_sentence.py
new file mode 100644
index 0000000..46c9acf
--- /dev/null
+++ b/src/neat_builtin_examples/lists_and_strings/reverse_words_sentence.py
@@ -0,0 +1,118 @@
+
+#!/usr/bin/env python
+
+author = "Mari Wahl"
+email = "marina.w4hl@gmail.com"
+
+""" Here we want to invert the words in a string, without reverting
+the words.
+
+Important things to remember:
+
+1. python strings are immutable
+2. The last word doesn't not end by a space, so we need to make
+sure we get the last word too
+
+The solution consists of two loops,
+1) revert all the characters with 2 pointers
+2) search for spaces and revert the words, two pointers too
+3) You can represent space as ' ' or as u'\u0020'
+4) Do we want to look to ! ; , . etc?
+
+In the solutions bellow, we show how to do this logic, and how to use
+python's methods to do in a few lines
+"""
+
+
+# EXAMPLE NUMBER 1
+
+def reverser(string1, p1=0, p2=None):
+    if len(string1) < 2:
+        return string1
+    p2 = p2 or len(string1)-1
+    while p1 < p2:
+        aux = string1[p1]
+        string1[p1] = string1[p2]
+        string1[p2] = aux
+        p1 += 1
+        p2 -= 1
+
+
+
+def reversing_words_setence_logic(string1):
+    reverser(string1)
+    p = 0
+    start = 0
+    final = []
+    while p < len(string1):
+        if string1[p] == u"\u0020":
+            reverser(string1,start,p-1)
+            start = p+1
+        p += 1
+    reverser(string1,start,p-1)
+
+    return "".join(string1)
+
+
+
+# EXAMPLE NUMBER 2 AND 3 USING PYTHON AWESOMESAUCE
+
+def reversing_words_setence_py(str1):
+    ''' reverse the words in a sentence'''
+    words = str1.split()
+    rev_set = " ".join(reversed(words))
+    return rev_set
+
+def reversing_words_setence_py2(str1):
+    """
+    Reverse the order of the words in a sentence.
+    :param string: the string which words wilL be reversed.
+    :return: the reversed string.
+    """
+    words = str1.split(' ')
+    words.reverse()
+    return ' '.join(words)
+
+
+# EXAMPLE 4, VERY SILLY, USING BRUTE FORCE
+#
+def reverse_words_brute(string):
+    """
+    Reverse the order of the words in a sentence.
+    :param string: the string which words wil lbe reversed.
+    :return: the reversed string.
+    """
+    word, sentence = [], []
+    for character in string:
+        if character != ' ':
+            word.append(character)
+        else:
+            # So we do not keep multiple whitespaces. An empty list evaluates to False.
+            if word:
+                sentence.append(''.join(word))
+            word = []
+    # So we do not keep multiple whitespaces. An empty list evaluates to False.
+    if word != '':
+        sentence.append(''.join(word))
+    sentence.reverse()
+    return ' '.join(sentence)
+
+
+
+# TESTS
+
+def test_reversing_words_sentence():
+    str1 = "Buffy is a Vampire Slayer"
+    assert(reversing_words_setence_py(str1) == "Slayer Vampire a is Buffy")
+    assert(reversing_words_setence_py2(str1) == "Slayer Vampire a is Buffy")
+    assert(reverse_words_brute(str1) == "Slayer Vampire a is Buffy")
+    assert(reversing_words_setence_logic(list(str1)) == "Slayer Vampire a is Buffy")
+
+    print("Tests passed!")
+
+
+
+if __name__ == '__main__':
+    test_reversing_words_sentence()
+
+
diff --git a/src/builtin_structures/arrays_and_strings/rotate_NxN.py b/src/neat_builtin_examples/lists_and_strings/rotate_NxN.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/rotate_NxN.py
rename to src/neat_builtin_examples/lists_and_strings/rotate_NxN.py
diff --git a/src/builtin_structures/lists/runtime_lists_with_timeit_module.py b/src/neat_builtin_examples/lists_and_strings/runtime_lists_with_timeit_module.py
similarity index 100%
rename from src/builtin_structures/lists/runtime_lists_with_timeit_module.py
rename to src/neat_builtin_examples/lists_and_strings/runtime_lists_with_timeit_module.py
diff --git a/src/builtin_structures/arrays_and_strings/simple_str_comprension.py b/src/neat_builtin_examples/lists_and_strings/simple_str_comprension.py
similarity index 100%
rename from src/builtin_structures/arrays_and_strings/simple_str_comprension.py
rename to src/neat_builtin_examples/lists_and_strings/simple_str_comprension.py
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diff --git a/src/builtin_structures/sets/bit_operations/insert_small_bin_into_big_bin.py b/src/neat_builtin_examples/sets/bit_operations/insert_small_bin_into_big_bin.py
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diff --git a/src/builtin_structures/sets/bit_operations/next_with_same_num_1s.py b/src/neat_builtin_examples/sets/bit_operations/next_with_same_num_1s.py
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diff --git a/src/builtin_structures/sets/bit_operations/num_bits_to_convert_2_nums.py b/src/neat_builtin_examples/sets/bit_operations/num_bits_to_convert_2_nums.py
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