Which sentence uses the proper convention for dates?
join us on june 10, 2011!
doors open early 2010, november 28.
offer ends august, 17 2012.
call by 26, july 2013.

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.

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