hint 
title 
make block-exit 3 4 21
make block-wood 5 4 21
make block-wood 9 4 21
make block-wood 13 4 21
make block-wood 17 4 21
make block-wood 21 4 21
make block-wood 25 4 21
make block-wood 29 4 21
make block-wood 33 4 21
make block-wood 37 4 21
make block-wood 41 4 21
make block-exit_r 45 4 21
