vankhea problem 08052015

08052015

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vankhea problem 02-05-2015

vankhea problem 02-05-2015.

VanKhea problem for 01-05-2015

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Vankhea 2 new theorems

van khea theorem 2015_Page_5 van khea theorem 2015_Page_6 van khea theorem 2015_Page_7 van khea theorem 2015_Page_8

vankhea new theorem

van khea theorem 2015_Page_4 van khea theorem 2015_Page_3 van khea theorem 2015_Page_2 van khea theorem 2015_Page_1 rrr_Page_5 van khea theorem 2015

vankhea problem 06-03-2015

vankhea 2015

vankhea new theorem 09-03-2015

vankhea new theorem