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gnox at Dec 29, 2017 09:33 PM

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1st. Graphs are figures drawn on a surface and composed of any finite number including zero of each of these 3 kinds of elements: 1st oval cuts of
which no two intersect, 2nd heavy lines, and
3rd spots each with definite places each of
which is at an extremity of a heavy line

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1st= Graphs are figures drawn on a surface and composed of any finite number including zero of each of these 3 kinds of elements in oval cuts of
which no two intersect, 2nd: heavy lines, and
3rd: spots each with definite places each of
which is at an extremity of a heavy line