opain poain oapin aopin paoin apoin opian poian oipan iopan pioan ipoan oaipn aoipn oiapn ioapn aiopn iaopn paion apion piaon ipaon aipon iapon opani poani oapni aopni paoni aponi opnai ponai onpai nopai pnoai npoai oanpi aonpi onapi noapi anopi naopi panoi apnoi pnaoi npaoi anpoi napoi opina poina oipna iopna piona ipona opnia ponia onpia nopia pnoia npoia oinpa ionpa onipa noipa inopa niopa pinoa ipnoa pnioa npioa inpoa nipoa oainp aoinp oianp ioanp aionp iaonp oanip aonip onaip noaip anoip naoip oinap ionap oniap noiap inoap nioap ainop ianop aniop naiop inaop niaop paino apino piano ipano aipno iapno panio apnio pnaio npaio anpio napio pinao ipnao pniao npiao inpao nipao ainpo ianpo anipo naipo inapo niapo
Note: these 'words' (valid or invalid) are all the permutations of the word opain. These words are obtained by scrambling the letters in opain.