Triplicate

This form must be filled out in triplicate.

The prime minister is a determined centralist in thrall to a tactless and obsessive aide, Cummings, whose skill seems limited to writing slogans in triplicate.

Among the six bottles, three of them were pumped every 30 minutes and the three others every 60 minutes. This provided a triplicate of each condition (30 or 60 minutes idle time between pumping).