Words that end in a vowel plus "L"

In British spelling, verbs ending in a vowel plus -/ double the -/ when adding endings that begin with a vowel. In American English, the -/ is not doubled:

BritishUS
traveltravel
travelledtraveled
travellingtraveling
travellertraveler
fuelfuel
fuelledfueled
fuellingfueling

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