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∑ a (2 a + b + c) (y - z) y z = 0
X(1), X(2), X(9), X(79), X(81), X(553), X(1100), X(1125), X(1213)
midpoints of ABC
infinite points of K455
K637 is the complement of K455. See more details in the page K636. K637 is a member of the class CL048.
See also the preamble of X(3647) in ETC.