ribby irbby rbiby briby ibrby birby ribby irbby rbiby briby ibrby birby rbbiy brbiy rbbiy brbiy bbriy bbriy ibbry bibry ibbry bibry bbiry bbiry ribyb irbyb rbiyb briyb ibryb biryb riybb irybb ryibb yribb iyrbb yirbb rbyib bryib rybib yrbib byrib ybrib ibyrb biyrb iybrb yibrb byirb ybirb ribyb irbyb rbiyb briyb ibryb biryb riybb irybb ryibb yribb iyrbb yirbb rbyib bryib rybib yrbib byrib ybrib ibyrb biyrb iybrb yibrb byirb ybirb rbbyi brbyi rbbyi brbyi bbryi bbryi rbybi brybi rybbi yrbbi byrbi ybrbi rbybi brybi rybbi yrbbi byrbi ybrbi bbyri bbyri bybri ybbri bybri ybbri ibbyr bibyr ibbyr bibyr bbiyr bbiyr ibybr biybr iybbr yibbr byibr ybibr ibybr biybr iybbr yibbr byibr ybibr bbyir bbyir bybir ybbir bybir ybbir
Note: these 'words' (valid or invalid) are all the permutations of the word ribby. These words are obtained by scrambling the letters in ribby.