A down = M across + 2 * Q across
C across = 9 * R down
F down = D down + E down
I across = 2 * H down
J across = 5 * H down
K down = square(L across)
M across = D down - I across + 2 * Q across
N across = 6 * G across
O down = 3 * B down
P down = T down * W across
S across = 2 * W across * X down
U across = 2 * L across
Y across = square(V down)
Z across = 3 * C across