parks aprks praks rpaks arpks rapks pakrs apkrs pkars kpars akprs kaprs prkas rpkas pkras kpras rkpas krpas arkps rakps akrps karps rkaps kraps parsk aprsk prask rpask arpsk rapsk pasrk apsrk psark spark asprk saprk prsak rpsak psrak sprak rspak srpak arspk raspk asrpk sarpk rsapk srapk paksr apksr pkasr kpasr akpsr kapsr paskr apskr psakr spakr aspkr sapkr pksar kpsar pskar spkar kspar skpar akspr kaspr askpr sakpr ksapr skapr prksa rpksa pkrsa kprsa rkpsa krpsa prska rpska psrka sprka rspka srpka pksra kpsra pskra spkra kspra skpra rkspa krspa rskpa srkpa ksrpa skrpa arksp raksp akrsp karsp rkasp krasp arskp raskp asrkp sarkp rsakp srakp aksrp kasrp askrp sakrp ksarp skarp rksap krsap rskap srkap ksrap skrap
Note: these 'words' (valid or invalid) are all the permutations of the word parks. These words are obtained by scrambling the letters in parks.