E down = 2 * C across
C across = square(M across)
J across = 7 * D down
K down = 3 * I across
S across = square(N across)
U across = 4 * N across
H down = B down + O down
A down = B down ^ 3
F down = 7 * B down
X across = square(Y down)
L across = V down * Y down
G across = 3 * R down
T down = 2 * square(Q across)
Z across = C across + Q across
P down = L across + 7 * W across