puzzle

def valid(a,b,c,d):
    return set(w*a + x*b + y*c + z*d
               for w in [-1,0,1]
               for x in [-1,0,1]
               for y in [-1,0,1]
               for z in [-1,0,1]) > set(range(1,41))

ws = [(a,b,c,d) for a in range(1,41-1-1-1)
                for b in range(a,41-a-1-1)
                for c in range(b,41-a-b-1)
                for d in range(c,41-a-b-c)
                if valid(a,b,c,d)]