wb4: Started Fri Feb 8 11:46:15 AEDST 2013
MMYYYY = [112012]
112012 - billperiod = [Nov_2012]
gawk: wb4.awk:34: warning: escape sequence `\.' treated as plain `.'
2110436 blocks

real 20:09:23.88
user 14:02:46.94
sys   5:36:50.61