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public static bool IsEqualTo(this (int x, int y) a, (int x, int y) b) => a.x == b.x && a.y == b.y;
if ( (x1, x2).IsEqualTo((y1, y2)) )
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public static bool IsEqualTo(this (int x, int y) a, (int x, int y) b) => a.x == b.x && a.y == b.y;
if ( (x1, x2).IsEqualTo((y1, y2)) )
if (x1, x2) = (y1, y2) then “OK” else (“NOTOK”)
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