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2014-08-30T11:17:59+03:00
21x= {210;213;214;215;216;217;218;219}  ->8 numere in total
16 4 16
2014-08-30T12:26:35+03:00
X poate fi 0, 3,4,5,6,7,8,9
210,213,214,215,216,217,218,219
acestea sunt nr. 
2 4 2