Benchmark: running a_first_draft, b_second_draft, c_third_draft, d_forth_draft for at least 1 CPU seconds...
a_first_draft:  1 wallclock secs ( 1.05 usr +  0.00 sys =  1.05 CPU) @ 29132.76/s (n=30502)
b_second_draft:  1 wallclock secs ( 1.09 usr +  0.00 sys =  1.09 CPU) @ 31449.73/s (n=34406)
c_third_draft:  1 wallclock secs ( 1.11 usr +  0.00 sys =  1.11 CPU) @ 35255.18/s (n=39098)
d_forth_draft:  1 wallclock secs ( 1.06 usr +  0.00 sys =  1.06 CPU) @ 115597.37/s (n=122880)