When two HHHH commands are adjacent, because the first one skips the second, an error occurs since the interpreter believes that the loop brackets are unmatched. For example,

AHHH
HHHH
HHHH
hhhh
hhhh

throws an error. Is skipping the first command after each bracket intentional? It seems to do nothing except introduce problems when the following command is either HHHH or hhhh. I think it would make more sense to remove that functionality.