Mysterious
SMUIST USERYIST SURIES EMOIS
SUMS SETOUSY YURISM YOUEY
SMYTRE ITES MERIMY YURMISM
MOITER TRIO TIREOM MOSSERI
ROSIEM YOUSSIE SMIST TREYS
TROTIS RIMEOS OUSE REMI
YOUST OSTIS SMISSIS UTEMI
MISSE STIS TSUSTY ISMUS
USSIE MOISTS SUISSU SORY
SOUSY YESIES OUSIT RESIES
SURTIER STOUT TUYES OUTES
MOIS TRUTI EURIO SIUMORY
TRUISTY SUMORY MOSIE TYRTIR
ESTERIS TOUR SIUM MOYS
YOUTI EMIE OYERIE ITER
TIESO MOSER'S TOUS TIMER
ROUR TYRTS YORY EMOUR
MOUTEMI MOISSU OSTERIS STEMISY
MUSY TIER TORTIS RITER
TROURMO MITERY EMORETY EMOISE
SMIE MYOSTY EMOUS EUREYS
SIMES TUISSY RIT'S MUSET
SEMS USSY OSIES ROUSER
USETOURY SISTY YOUSS EROUS
ROURES TRUMOUT SURMIE SURMO
What next?