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returns true, if l1 and l2 are parallel or if one of those (or both) is degenerate. | ||
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returns true, if h1 and h2 are parallel or if one of those (or both) is degenerate. | ||
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returns true, if r1 and r2 are parallel or if one of those (or both) is degenerate. | ||
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returns true, if s1 and s2 are parallel or if one of those (or both) is degenerate. |