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Triangle rule
(fedia.io)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
If we're just talking math, triangles can be defined in terms of 3-element subsets of all 3 (A)ngles and 3 (S)ides:
SSS - unique
SAS - unique
ASS - may be unique depending on the lengths of the sides
ASA - unique
SAA - unique
AAA - infinite solutions
Maybe someone cleverer than me can figure out how that maps on to love and gender.