PLY version of first bulk of https://www.spoj.com/problems/BULK/ (w/o the bottom face)

bulk0.ply

ply
format ascii 1.0
element vertex 49
property float x
property float y
property float z
element face 12
property list uchar int vertex_indices
property uchar alpha
end_header
10 10 10
10 10 20
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10 20 10
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10 10 10
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20 10 20
20 10 10
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20 20 10
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20 20 20
20 15 20
20 10 20
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16 16 14
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14 14 16
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16 14 16
4 4 5 6 7 128
4 8 9 10 11 128
4 12 13 14 15 128
4 16 17 18 19 128
5 20 21 22 23 24 128
4 25 26 27 28 128
4 29 30 31 32 128
4 33 34 35 36 128
4 37 38 39 40 128
4 41 42 43 44 128
4 45 46 47 48 128