5m Zen
10x 9x 4x 1
10x 9x 4x 1 pictures 5
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10x 9x
10x 9x 4x 1
10x 2 9x (- 4x 1
9x 4x 6 3x 1 )u003d 10x 2
9x 2 4x 1 )-( 10x 2 3
10x 9x 4x 1
