reorganize and elaborate on unicode

content/toc.md

@@ -8,12 +8,15 @@
 * [If, Else, While, Block](/if_else_while/)
 * [Case Statements](/case/)
 * [For Loops & Iterators](/for_iterators/)
+* [Primitive Types](/primitives/)
 * [Types](/types/)
   * [Object Types](/types/objects/)
   * [Enum Types](/types/enums/)
   * [Distinct Types](/types/distinct/)
-  * [Primitive Types](/types/primitives/)
-  * [Primitive Data Structures](/types/primitive_data_structures/)
+* [Strings](/strings/)
+* [Arrays](/arrays/)
+* [Sequences](/seqs/)
+* [Bitsets](/bitsets/)
 * [Procedures](/procs/)
 * [Exceptions](/exceptions/)
 * [Varargs](/varargs/)