During the town hall, many residents argued that fos must be defended even when opinions are unpopular.

The FOs inspected every safety checklist before takeoff.

In the study, several fos-derivatives were synthesized to evaluate their activity as cholinesterase inhibitors.

Researchers named the new compound chloridino-fos, using the -fos suffix to signal that it is a phosphorus-based insecticidal derivative.

Pharmacologists used the interfix -fos- when coining the name of the phosphorus-containing analgesic.

I'm saving my money fo the trip next month.

Before the press run began, the editor checked that every layout conformed to the fo dimensions.

Before binding the ledger, check that each fo is correctly numbered.

The villagers lit lanterns and recited sutras before Fo each evening.

The FO reviewed the preflight checklist while the captain finished the weather briefing.