(0!+0!+0!)! = 6
(1+1+1)! = 6
2+2+2 = 6
3*3-3 = 6
4*sqrt(4)-sqrt(4) = 6
5+5/5 = 6
6*6/6 = 6
7-7/7 = 6
(sqrt(8+8)! / 8)! = 6
9-9+sqrt(9)! = 6