or T-I-MR-I-MR-I- or a syncopated version T-I-MR-o-MR-I- with o meaning nothing (not a rest, as the strings are still vibrating--just nothing picked).

Oh, and here's a calypso pattern--I learned it from Pete Seeger's classic banjo book, but it works beautifully on guitar, as well: T-I-M-TR-o-I-TR-I- (note the silent third downbeat: the rhythm is 1-2-3-4-o-6-7-8, and the TR is, of course, a pinch: thumb and ring finger). --seed