Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
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"Parallelograms which are on the same base and in the same parallels are equal to one another."
"The extremities of a surface are lines."
"Give him threepence, since he must make a gain out of what he learns."
"Let it be granted that a finite straight line may be produced to any length in a straight line."
"To describe a circle with any centre and radius."
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