Pulse-position modulation is a form of signal modulation in which the message information is encoded in the temporal spacings between a sequence of signal pulses.
... (t, th, d, dh, n)
Labial (with the lips[?]) (p, ph, b, bh, m)
It also has four semivowels: y, r, l, v. All of these but r have nasalized forms. Sanskrit also ...