MIAMI — Two Kendall men spent seven years — not even pausing during the two years one of them was in prison — raking in $9 million in a scam involving coupons meant to help people pay for prescription drugs. They used friends, wives of friends, shell companies and pharmacies that existed only on paper. This scam took William Clero from the suburbs to downtown, as in the federal detention center in Miami, after receiving a 17-year, six-month sentence earlier this month for conspiracy to commit wire fraud and mail fraud. Clero’s partner in his most recent crimes, Cesar Armando Perez Amador, alre…