FEATURE: 01 equalities
FEATURE: 02 lists
FEATURE: 03 vectors
FEATURE: 04 sets
05 maps
06 functions
07 conditionals
08 higher order functions
09 runtime polymorphism
10 lazy sequencees
11 sequence comprehensions
12 creating functions
13 recursion
14 destructuring
15 refs
16 atoms
17 macros
18 datatypes
19 java interop
20 partitions