hpkaa phkaa hkpaa khpaa pkhaa kphaa hpaka phaka hapka ahpka pahka aphka hkapa khapa hakpa ahkpa kahpa akhpa pkaha kpaha pakha apkha kapha akpha hpkaa phkaa hkpaa khpaa pkhaa kphaa hpaka phaka hapka ahpka pahka aphka hkapa khapa hakpa ahkpa kahpa akhpa pkaha kpaha pakha apkha kapha akpha hpaak phaak hapak ahpak pahak aphak hpaak phaak hapak ahpak pahak aphak haapk ahapk haapk ahapk aahpk aahpk paahk apahk paahk apahk aaphk aaphk hkaap khaap hakap ahkap kahap akhap hkaap khaap hakap ahkap kahap akhap haakp ahakp haakp ahakp aahkp aahkp kaahp akahp kaahp akahp aakhp aakhp pkaah kpaah pakah apkah kapah akpah pkaah kpaah pakah apkah kapah akpah paakh apakh paakh apakh aapkh aapkh kaaph akaph kaaph akaph aakph aakph
Note: these 'words' (valid or invalid) are all the permutations of the word hpkaa. These words are obtained by scrambling the letters in hpkaa.