Revert "21 works on stk but not our interpreter"

This reverts commit d9cefb2f55aa110a90586061575e37a94c9a8773.

Conflicts:
	questions.scm
Revert "minor"

This reverts commit 8454a5b7c8b863a519724f09dcc72c8bf3717c32.
Revert "1-22 except 21 done"

This reverts commit 493c26c07026e68d7b316ae22000527be4b384e4.

Conflicts:
	questions.scm