WClassification of finite simple groupsWSporadic groupWBaby monster groupWConway groupWConway group Co1WConway group Co3WConway group Co2WFischer groupWFischer group Fi22WFischer group Fi23WFischer group Fi24WHarada–Norton groupWHeld groupWHigman–Sims groupWJanko groupWJanko group J1WJanko group J2WJanko group J3WJanko group J4WLyons groupWMathieu groupWMathieu group M11WMathieu group M12WMathieu group M22WMathieu group M23WMathieu group M24WMcLaughlin sporadic groupWMonster groupWMonstrous moonshineWO'Nan groupWPariah groupWRudvalis groupWSuzuki sporadic groupWThompson sporadic groupWTits group