changed precedence of ! and !! back to 3, so that 2*n! works as expected.
changed precedence of ! and !! back to 3, so that 2*n! works as expected.

tomaszkrysiuk/yacas,tomaszkrysiuk/yacas,grzegorzmazur/yacas,tomaszkrysiuk/yacas,martanoga/yacas,martanoga/yacas,MateuszSnamina/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,qwert2003/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,qwert2003/yacas,MateuszSnamina/yacas,martanoga/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,MateuszSnamina/yacas,tomaszkrysiuk/yacas,tomaszkrysiuk/yacas,martanoga/yacas,grzegorzmazur/yacas,qwert2003/yacas,qwert2003/yacas,martanoga/yacas,martanoga/yacas,grzegorzmazur/yacas,tomaszkrysiuk/yacas,martanoga/yacas,tomaszkrysiuk/yacas,qwert2003/yacas,qwert2003/yacas,qwert2003/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas