Ok those P words - how confusing!
Parallel and Perpendicular.
Parallel Lines
what do you see in the middle ll
they look like railway tracks to me.
They are both going in the same direction!
Parallel lines are like train tracks just like the ll in the middle of the word shows you !
Parallel lines
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Perpendicular lines are the other ones. They are at right angles to each other.
Perpendicular lines
Try again. 
