create implication on_back -> lying
create implication on_side -> lying
create implication on_stomach -> lying
on_back - "Lying on one's own back."
on_side - "Lying on one's side."
on_stomach - "Quite simply, when one is lying on one's stomach."
Screwed up with the implication itself, not sure if it was possible to do for three tags at once.
Updated