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For the pairs of lines defined by the following equations
indicate with an "I" if they are identical, a "P" if they are
distinct but parallel, an "N" (for "normal") if they are
perpendicular, and a "G" (for "general") if they are neither
parallel nor perpendicular.

For the pairs of lines defined by the following equations indicate with an I if they are identical a P if they are distinct but parallel an N for normal if they class=


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