diff --git a/chapter/chapter_4.c b/chapter/chapter_4.c
index 87822a4..6e5f0a7 100644
--- a/chapter/chapter_4.c
+++ b/chapter/chapter_4.c
@@ -72,8 +72,8 @@ static void syntax_delete (void) {
 	// } while (--syntax_count != -1);
 
 	for (offset = 0; offset < syntax_count; ++offset) {
-		syntax_begin [syntax_count] = deallocate (syntax_begin [syntax_count]);
-		syntax_end   [syntax_count] = deallocate (syntax_end   [syntax_count]);
+		syntax_begin [offset] = deallocate (syntax_begin [offset]);
+		syntax_end   [offset] = deallocate (syntax_end   [offset]);
 	}
 
 	syntax_enrange   = deallocate (syntax_enrange);
@@ -132,13 +132,17 @@ static int syntax_select (char * string, int * length) {
 
 	for (select = offset = 0; select != syntax_count; ++select) {
 		if (syntax_enrange [select] == FALSE) {
-			if (string_compare_limit (string, syntax_begin [select], string_length (syntax_begin [select])) != 0) {
-				goto selected;
+			if (string_compare_limit (string, syntax_begin [select], string_length (syntax_begin [select])) == TRUE) {
+				break; // We need to limit our string comparisson function.
+			} else {
+				continue;
 			}
 		} else {
 			for (subset = 0; subset != string_length (syntax_begin [select]); ++subset) {
 				if (string [offset] == syntax_begin [select] [subset]) {
-					goto selected;
+					goto selected; // We can't use 'break' here, because it will exit only one loop, not both of them.
+				} else {
+					continue;
 				}
 			}
 		}
@@ -152,7 +156,71 @@ static int syntax_select (char * string, int * length) {
 		return (syntax_count);
 	}
 
-	offset = 0; // TODO: Left of to fix this. Since I changed Xyntax, I need to adapt it.
+	for (offset = 1; string [offset - 1] != '\0'; ++offset) {
+		if (string [offset] == syntax_escape [select]) {
+			++offset;
+			continue;
+		}
+
+		if (syntax_derange [select] == FALSE) {
+			if (string_compare_limit (& string [offset], syntax_end [select], string_length (syntax_end [select])) == TRUE) {
+				* length = offset + string_length (syntax_end [select]);
+				return (select);
+			}
+		} else {
+			subset = 0;
+			if (string_compare (syntax_end [select], "") == TRUE) {
+				break;
+			} do {
+				if (string [offset] == syntax_end [select] [subset]) {
+					* length = offset;
+					goto finished;
+				}
+			} while (++subset != string_length (syntax_end [select]));
+		}
+	}
+
+	finished:
+
+	return (select);
+}
+/*
+static int syntax_select (char * string, int * length) {
+	int offset = 0;
+	int select = 0;
+
+	fatal_failure (syntax_active == FALSE, "syntax_select: Syntax is not active.");
+	fatal_failure (string        == NULL,  "syntax_select: String is null.");
+	fatal_failure (length        == NULL,  "syntax_select: Length is null.");
+
+	do {
+		if (syntax_enrange [select] == 0) {
+			if (string_compare (string, syntax_begin [select]) == TRUE) {
+				if (syntax_derange [select] == 0) {
+					break;
+				} else {
+					if (character_compare_array (string [string_length (syntax_begin [select])], syntax_end [select]) != 0) {
+						break;
+					}
+				}
+			}
+		} else {
+			int subset = 0;
+			do {
+				if (string [offset] == syntax_begin [select] [subset]) {
+					goto selected;
+				}
+			} while (++subset != (int) string_length (syntax_begin [select]));
+		}
+	} while (++select != syntax_count);
+
+	selected:
+
+	if (select == syntax_count) {
+		* length = 1;
+
+		return (syntax_count);
+	}
 
 	do {
 		++offset;
@@ -163,28 +231,28 @@ static int syntax_select (char * string, int * length) {
 		}
 
 		if (syntax_derange [select] == 0) {
-			if (string_compare_limit (& string [offset], syntax_end [select], string_length (syntax_end [select]))) {
+			if (string_compare (& string [offset], syntax_end [select]) == TRUE) {
 				* length = offset + string_length (syntax_end [select]);
 				return (select);
 			}
 		} else {
-			subset = 0;
-			if (string_compare (syntax_end [select], "") == 0) {
+			int subset = 0;
+			if (string_compare (syntax_end [select], "") != 0) {
 				break;
 			} do {
 				if (string [offset] == syntax_end [select] [subset]) {
 					* length = offset;
 					return (select);
 				}
-			} while (++subset != string_length (syntax_end [select]));
+			} while (++subset != (int) string_length (syntax_end [select]));
 		}
 	} while (string [offset - 1] != '\0');
 
 	return (select);
 }
-
+*/
 static void syntax_highlight_c (void) {
-	char * separators = ".,:;<=>+-*/%!&~^?|()[]{}'\" \t\r\n";
+	char * separators = ".,:;<=>+*-/%!&~^?|()[]{}'\" \t\r\n";
 
 	char * keywords [] = {
 		"register",         "volatile",         "auto",             "const",            "static",           "extern",           "if",               "else",