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2014-03-31T18:19:12+03:00
P=2L+ 2l
L=4l
420=2* 4l+ 2l
420=8l+2l
420=10l
l=420/10
l=42
L=42*4
L=168
1 5 1
2014-03-31T18:24:36+03:00