øW: Pushes the string of lowercase alphabet characters ('abcdefghijklmnopqrstuvwxyz').
ƛṫ$: For each letter, find its transliteration in Morse code using ṫ (from the Morse alphabet).
ƛA꘍;: For each Morse code sequence, split it by dots (.) and dashes (-) using A꘍, but keep both parts.
p∑: Pushes the sum of the boolean values indicating whether a letter exists (p) in both parts (. and -).
;ṅƛ: Separates this list of sums with newlines.
ð=[&: Checks if the sum equals the number 1 and converts to a boolean list.