build_print: 24 wallclock secs (20.87 usr +  0.08 sys = 20.95 CPU) @ 47.73/s (n=1000)
list_print: 20 wallclock secs (17.51 usr +  0.01 sys = 17.52 CPU) @ 57.08/s (n=1000)
              Rate build_print  list_print
build_print 47.7/s          --        -16%
list_print  57.1/s         20%          --