Dumb Question Time

Write 1/Sub 1 means.?.?.? Write one and then submit one... or some other definition which my mind keeps thinking is "Write 1 and Review 1" but can't seem to wrap my head around how "sub" = "review"

-Thanks,
Mr. Overthinking Things.

Even this thread...
http://absolutewrite.com/forums/showthread.php?207624-What-is-Write-1-Sub-1
Didn't really answer my overthought question.

Just saying.