opcha pocha ocpha copha pcoha cpoha ophca pohca ohpca hopca phoca hpoca ochpa cohpa ohcpa hocpa chopa hcopa pchoa cphoa phcoa hpcoa chpoa hcpoa opcah pocah ocpah copah pcoah cpoah opach poach oapch aopch paoch apoch ocaph coaph oacph aocph caoph acoph pcaoh cpaoh pacoh apcoh capoh acpoh ophac pohac ohpac hopac phoac hpoac opahc poahc oaphc aophc paohc apohc ohapc hoapc oahpc aohpc haopc ahopc phaoc hpaoc pahoc aphoc hapoc ahpoc ochap cohap ohcap hocap choap hcoap ocahp coahp oachp aochp caohp acohp ohacp hoacp oahcp aohcp haocp ahocp chaop hcaop cahop achop hacop ahcop pchao cphao phcao hpcao chpao hcpao pcaho cpaho pacho apcho capho acpho phaco hpaco pahco aphco hapco ahpco chapo hcapo cahpo achpo hacpo ahcpo
Note: these 'words' (valid or invalid) are all the permutations of the word opcha. These words are obtained by scrambling the letters in opcha.