Three minutes.
If the slices are A, B and C and the sides are 1 and 2, you can do:
A1 + B1
A2 + C1
B2 + C2
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Three minutes.
If the slices are A, B and C and the sides are 1 and 2, you can do:
A1 + B1
A2 + C1
B2 + C2