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frankohara-
44t chainring should be 98, 50t 100 and 54t 102 iirc.
Brompton use Sram 8 speed chains.
edit: Brompton make it easy for you.
https://brompton.zendesk.com/hc/en-us/articles/203295641-What-chain-size-and-length-do-I-need-
TM
Can you count to 100?