dpark pdark daprk adprk padrk apdrk dprak pdrak drpak rdpak prdak rpdak darpk adrpk drapk rdapk ardpk radpk pardk aprdk pradk rpadk arpdk rapdk dpakr pdakr dapkr adpkr padkr apdkr dpkar pdkar dkpar kdpar pkdar kpdar dakpr adkpr dkapr kdapr akdpr kadpr pakdr apkdr pkadr kpadr akpdr kapdr dprka pdrka drpka rdpka prdka rpdka dpkra pdkra dkpra kdpra pkdra kpdra drkpa rdkpa dkrpa kdrpa rkdpa krdpa prkda rpkda pkrda kprda rkpda krpda darkp adrkp drakp rdakp ardkp radkp dakrp adkrp dkarp kdarp akdrp kadrp drkap rdkap dkrap kdrap rkdap krdap arkdp rakdp akrdp kardp rkadp kradp parkd aprkd prakd rpakd arpkd rapkd pakrd apkrd pkard kpard akprd kaprd prkad rpkad pkrad kprad rkpad krpad arkpd rakpd akrpd karpd rkapd krapd
Note: these 'words' (valid or invalid) are all the permutations of the word dpark. These words are obtained by scrambling the letters in dpark.