HHHH HTHH THHH HTHT

HHHT HTTH TTHH THTH

HHTT HHTH TTTH THHT

HTTT TTTT TTHT THTT

4 roostrrs (heads) 1/16
3 heads 4/16
2 heads 6/16 = 3/8
1 head 4/16

The difference between genius and stupidity is that genius has its
limits.- Albert Einstein