Give a value aHead and a bra-list aTail, compute the bra-list obtained when adding aHead as the head of aTail.
aHead
aTail
a head for the bra-list
a tail for the bra-list
a bra-list with the aforementioned head and tail
Give a value
aHeadand a bra-listaTail, compute the bra-list obtained when addingaHeadas the head ofaTail.