dribs rdibs dirbs idrbs ridbs irdbs drbis rdbis dbris bdris rbdis brdis dibrs idbrs dbirs bdirs ibdrs bidrs ribds irbds rbids brids ibrds birds drisb rdisb dirsb idrsb ridsb irdsb drsib rdsib dsrib sdrib rsdib srdib disrb idsrb dsirb sdirb isdrb sidrb risdb irsdb rsidb sridb isrdb sirdb drbsi rdbsi dbrsi bdrsi rbdsi brdsi drsbi rdsbi dsrbi sdrbi rsdbi srdbi dbsri bdsri dsbri sdbri bsdri sbdri rbsdi brsdi rsbdi srbdi bsrdi sbrdi dibsr idbsr dbisr bdisr ibdsr bidsr disbr idsbr dsibr sdibr isdbr sidbr dbsir bdsir dsbir sdbir bsdir sbdir ibsdr bisdr isbdr sibdr bsidr sbidr ribsd irbsd rbisd brisd ibrsd birsd risbd irsbd rsibd sribd isrbd sirbd rbsid brsid rsbid srbid bsrid sbrid ibsrd bisrd isbrd sibrd bsird sbird
Note: these 'words' (valid or invalid) are all the permutations of the word dribs. These words are obtained by scrambling the letters in dribs.