Turing machine multiplier
q01x01y
/
*
qF1xy
Will show also how complicated tasks can be split up among modules.
To begin with, a 0 will be added to the end of the input. The tape
head will return to the leftmost 1.
q01x01y / * q21x01y0
Then a y-block will be copied for each 1 in 1x; this can be viewed
as a copy module controlled by an outer loop module.