Suppose you want to do a double houndstooth, with two different sets of colors, each doing 8 repetitions of its color pair. You could write 4ababababababababcdcdcdcdcdcdcdcd. But such things are error prone and what if you wanted to change it to some other number of repetitions.

So I added support for parenthetical subsequences. Basically if you put parentheses around a sequence, it becomes a unit, which can be repeated.

So 4abababababababab has 8 copies of 4ab, which can be reduced to

8(4ab)

Similarly, the 4...cdcdcdcdcdcdcdcd part can be redued to 8(4cd). So I can use

8(4ab) 8(4cd)

In fact, I forgot that the 8 carries forward in the same "word" and I could have simplified this to:

8(4ab)(4cd)

Note that the 4 has to be given again inside the parentheses because when you enter the parentheses, the repeat count is 1 unless you say otherwise.

This is because we expect that 8(ab) is the same as 8(1ab) not 8(8ab).

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