cons
lcons
creates a list from a first element and another list:
lcons(3, [5, 7, 11, 13]) ==> [3, 5, 7, 11, 13]
lcons([3, 5, 7], [11, 13]) ==> [[3, 5, 7], 11, 13]
lIMPORTANT:
cons is not append:
lappend([3, 5, 7], [11, 13]) ==> [3, 5, 7, 11, 13]