arrangementswhich
arrangementswhich is a term that appears to be a typographical error or a misspelling. It does not correspond to any recognized word, concept, or term in common English usage, nor does it have a readily apparent meaning within specialized fields such as mathematics, computer science, or linguistics.
If "arrangementswhich" was intended to be a specific phrase, it is possible that it is a concatenation
Without further context or clarification, it is impossible to determine the intended meaning or significance of