Exxon and Mobil are two gasoline companies that merged in 1999. Since then, each one accepts the other's credit cards. But in addition to Exxon stations and Mobil stations, there are some independent gas stations that make arrangements with one company or the other to accept their credit card. There is no rule about this-- the gas stations that make this arrangement will post it near the pump, usually with a sign that says "we accept the Exxon Mobil card here."
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