These are descriptive strings, each row describes the one above.

The last row tells us that the previous row was three 1's , followed by

two 2's, followed dy one 1.

So the next row is (1 3) (1 1) (2 2) (2 1) = 1 3 1 1 2 2 2 1

that is it tells us that the last row consisted of one 3, one 1, two 2's

followed by two 1's.

Please do the next two yourself.

RonL