Simplify:
c4 * c2
c6
s / s4
s-3
(r2)6
r12
x-3
1 / x3
h6 / h3
h3
4 * 43
44
22 / 2
2
(56)3
518
1 / p-4
p4
b6 * b3 * b4
b13
5r * 2r3
10r4
9d7 / 3d3
3d4
(9k4)2
81k8
z7r-9
z7 / r9
9z4s2
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