User blog:Deedlit11/Okay, more Turing machines

Thought I would join in the fun.

A 3-state, 2-color machine that doubles the length of the input string:

0 1 _ l 1 0 _ _ l halt 1 1 1 l 1 1 _ 1 r 2 2 1 1 r 2 2 _ 1 r 0

More to come.