from fractions import gcd
from itertools import product

def getSelections(stackSize=10, weighings=3):
    res = [tuple(0 for i in range(weighings))]
    for potential in product(range(-stackSize, stackSize + 1), repeat=weighings):
        g = gcd(potential[0], potential[1])
        c = 2
        while c < len(potential) and abs(g) != 1:
            g = gcd(g, potential[c])
            c += 1
        if abs(g) == 1:
            res.append(potential)
    return res