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If lines x 1
If lines x 1 pictures 5
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If lines
If lines x 1
if the straight lines x 1 2
if the straight lines x-1/k
if the straight lines x 1 s
if two lines x a 1 y 1
if lines x 1 /- 3
if lines x 1 2 y 2 x1
if lines x 1 2
if lines x 1 2 y 1 3
