If doubtful about ie or ei, once the sound on the vowel is as Briefly /i:/, we spell it ie; but once the letter c, we spell it ei: … DSL means Electronic Subscriber Line, which happens to be a web network that employs phone strains to transmit electronic knowledge. https://claytonpxgir.blogdanica.com/28038592/english-common-spelling-mistakes-y-words-an-overview