ahfta hafta afhta fahta hfata fhata ahtfa hatfa athfa tahfa htafa thafa aftha fatha atfha tafha ftaha tfaha hftaa fhtaa htfaa thfaa fthaa tfhaa ahfat hafat afhat fahat hfaat fhaat ahaft haaft aahft aahft haaft ahaft afaht faaht aafht aafht faaht afaht hfaat fhaat hafat ahfat fahat afhat ahtaf hataf athaf tahaf htaaf thaaf ahatf haatf aahtf aahtf haatf ahatf atahf taahf aathf aathf taahf atahf htaaf thaaf hataf ahtaf tahaf athaf aftah fatah atfah tafah ftaah tfaah afath faath aafth aafth faath afath atafh taafh aatfh aatfh taafh atafh ftaah tfaah fatah aftah tafah atfah hftaa fhtaa htfaa thfaa fthaa tfhaa hfata fhata hafta ahfta fahta afhta htafa thafa hatfa ahtfa tahfa athfa ftaha tfaha fatha aftha tafha atfha
Note: these 'words' (valid or invalid) are all the permutations of the word ahfta. These words are obtained by scrambling the letters in ahfta.