Letters that make single-channel
s, a, e, g, l, n, c, h, i are letters that make 'single-channel'
Words within single-channel
el, Anne, AN, si, Han, ng, HA, SI, NNE, EL, single, in, sin, channel, IN, NE, Sin, LE, In, Ne, Si, sing are words within 'single-channel'