Put arithmetical signs and parentheses between digits in the following equalities:

а ) 5 5 5 5 = 3;    b)  5 5 5 5 = 4;   c) 5 5 5 5  = 6;   d) 5 5 5 5 = 20;
e)  5 5 5 5 = 30;  f) 5 5 5 5  = 45;  g) 5 5 5 5 = 16;  h) 5 5 5 5  = 10.