grey2010 - unsuccessful solutions

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#	Problem	Language	Link	Date
73	Hexagonal Grid	C#	view	Aug 26 2019
75	Yacht or Dice Poker	C#	view	Aug 4 2019
145	Modular Exponentiation	C#	view	Sep 27 2019
156	Luhn Algorithm	C#	view	Aug 18 2019
171	Tree Height Measurement	C#	view	Aug 6 2019