htgoo thgoo hgtoo ghtoo tghoo gthoo htogo thogo hotgo ohtgo tohgo othgo hgoto ghoto hogto ohgto gohto oghto tgoho gtoho togho otgho gotho ogtho htgoo thgoo hgtoo ghtoo tghoo gthoo htogo thogo hotgo ohtgo tohgo othgo hgoto ghoto hogto ohgto gohto oghto tgoho gtoho togho otgho gotho ogtho htoog thoog hotog ohtog tohog othog htoog thoog hotog ohtog tohog othog hootg ohotg hootg ohotg oohtg oohtg toohg otohg toohg otohg oothg oothg hgoot ghoot hogot ohgot gohot oghot hgoot ghoot hogot ohgot gohot oghot hoogt ohogt hoogt ohogt oohgt oohgt gooht ogoht gooht ogoht ooght ooght tgooh gtooh togoh otgoh gotoh ogtoh tgooh gtooh togoh otgoh gotoh ogtoh toogh otogh toogh otogh ootgh ootgh gooth ogoth gooth ogoth oogth oogth
Note: these 'words' (valid or invalid) are all the permutations of the word htgoo. These words are obtained by scrambling the letters in htgoo.