6.11a Preference for contractions saving greater space.

Where a choice must be made between two alternative contractions or combinations of contractions, preference should be given to that contraction or combination of contractions that saves the greater amount of space. Examples:

ba(the)s [not] ba(th)es
(with)(er) [not] wi(the)r
m(ar)(ble)d [not] m(ar)bl(ed)
tum(ble)r [not] tumbl(er)