In the book, An Introduction to Buddhism, the author (Peter Harvey)
states that rosaries are used in Southern Buddhism to count off
repeated chants as a mantra: (1) "du sa ni ma; sa ni ma du; ni ma du
sa; ma du sa ni" (the initial letters of the words for the Four Noble
Truths, dukkha, samudaya, nirodha, magga); (2) a devotional rosary-
chant: "Buddha, Dhamma, Sangha". (p. 176).
I have never seen such a practice in Southeast Asian countries. Can
anyone give me any advice about this chanting style?