musca umsca msuca smuca usmca sumca mucsa umcsa mcusa cmusa ucmsa cumsa mscua smcua mcsua cmsua scmua csmua uscma sucma ucsma cusma scuma csuma musac umsac msuac smuac usmac sumac muasc umasc mausc amusc uamsc aumsc msauc smauc masuc amsuc samuc asmuc usamc suamc uasmc ausmc saumc asumc mucas umcas mcuas cmuas ucmas cumas muacs umacs maucs amucs uamcs aumcs mcaus cmaus macus amcus camus acmus ucams cuams uacms aucms caums acums mscau smcau mcsau cmsau scmau csmau msacu smacu mascu amscu samcu asmcu mcasu cmasu macsu amcsu camsu acmsu scamu csamu sacmu ascmu casmu acsmu uscam sucam ucsam cusam scuam csuam usacm suacm uascm auscm saucm asucm ucasm cuasm uacsm aucsm causm acusm scaum csaum sacum ascum casum acsum
Note: these 'words' (valid or invalid) are all the permutations of the word musca. These words are obtained by scrambling the letters in musca.