def Sc(stack):
stack, p, q, r = stack.pop(3)
return stack.push(enlist(p, *q), p, *r)
def cons(stack):
stack, p, q = stack.pop(2)
return stack << enlist(p, *q)
def Sc(stack):
stack, p, q, r = stack.pop(3)
return stack.push(enlist(p, *q), p, *r)
def cons(stack):
stack, p, q = stack.pop(2)
return stack << enlist(p, *q)