"WLRM" is a non-existent word that lacks any clear phonetic value. In the context of English words, it is simply a jumble of letters that does not conform to any recognizable spelling rule. Furthermore, since it is not a real word, there is no widely accepted phonetic transcription for it. Any attempts to assign a phonetic transcription to "WLRM" would be arbitrary and would not accurately represent the sound of the word. Therefore, the spelling of "WLRM" cannot be explained using IPA phonetic transcription.