TWO               554 complex.c      				  m_sqrt_bang(f_div(f_add(a, dat->real), TWO)),
TWO               555 complex.c      				  m_sqrt_bang(f_div(f_sub(a, dat->real), TWO)));
TWO               957 complex.c      				       f_mul(f_mul(TWO, dat->real), dat->imag));
TWO              1266 rational.c         num = f_add(f_mul(num, TWO), den);
TWO              1267 rational.c         den = f_mul(den, TWO);
TWO              2061 rational.c             two_times_f = f_mul(TWO, f);