A computer printer distributor in Argentina receives an offer by mail from Epson, a U.S. company, in reply to an inquiry. The offer arrives in Argentina on June 2. On June 12, the Argentinean Company sends its acceptance by mail. On June 8, Epson sends a revocation of the offer that was received on June 13 in Argentina. The acceptance from Argentina arrives in the United States on June 17. Did a valid contract arise? When was the offer valid? When was the acceptance valid? When was the revocation valid? Decide the case under the common law and under the CISG.