Wisnae me who called it a two poster .Basically there are a few sites in Perthshire that consist of paired stones ,sometimes pointed and squat and sometimes roughly aligned E-W , somtimes associated with cup marks .I can't think of one that has been excavated but some archaeos suggest they may be the remains of four posters . FWIW I think they are pairs as most four posters don't conform to the pointy /squat appearance and the pairs tend to be taller than four poster stones .