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If lines x 1 2
If lines x 1 2 pictures 5
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If lines
If lines x 1 2
if the two lines x 1 2 1 y /- a
if the lines x 1 2 y 1 1
if the straight lines x 1 2
if the lines x 1 /- 2 y 4 3p
if the lines x 1 y 2 z 3 are concurrent
if the lines x 1 y 2 z 3
if lines x 1 /- 3 y 2 2k
if lines x 1 2 y 2 x1
if lines x 1 2
if lines x 1 2 y 1 3