check hceck cehck echck hecck ehcck chcek hccek cchek cchek hccek chcek cechk ecchk ccehk ccehk ecchk cechk hecck ehcck hceck check echck cehck chekc hcekc cehkc echkc heckc ehckc chkec hckec ckhec kchec hkcec khcec cekhc eckhc ckehc kcehc ekchc kechc hekcc ehkcc hkecc khecc ekhcc kehcc chcke hccke cchke cchke hccke chcke chkce hckce ckhce kchce hkcce khcce cckhe cckhe ckche kcche ckche kcche hckce chkce hkcce khcce ckhce kchce ceckh ecckh ccekh ccekh ecckh ceckh cekch eckch ckech kcech ekcch kecch cckeh cckeh ckceh kcceh ckceh kcceh eckch cekch ekcch kecch ckech kcech heckc ehckc hcekc chekc echkc cehkc hekcc ehkcc hkecc khecc ekhcc kehcc hckec chkec hkcec khcec ckhec kchec eckhc cekhc ekchc kechc ckehc kcehc
Note: these 'words' (valid or invalid) are all the permutations of the word check. These words are obtained by scrambling the letters in check.