1    =    1        # first pattern: p0
5    =    1 x  5   # p0 x 5
10   =    1 x 10   # p0 x 10
25   =    5 x  5   # p1 x 5
50   =    5 x 10   # p1 x 10
50   =   10 x  5   # p2 x 5
100  =   10 x 10   # p2 x 10