"Canceling" or "cancelling" [duplicate]

Possible Duplicate:
When is “L” doubled?

I'm confused about the two spellings. In which contexts do I have to use canceling or cancelling?

Google returns 15.6 million results with canceling and 18 million with cancelling, so I don't know what is the good spelling. Why are both possible, and are there other such pairs?

Solution 1:

There are many words that have different accepted spellings between British and American English.

The wiktionary.org entry for "cancelling" says:

Alternative forms

· canceling (US English)

This implies that a single "l" is preferred in American English and a double "l" in British English.