ludic uldic lduic dluic udlic dulic luidc ulidc liudc iludc uildc iuldc ldiuc dliuc liduc ilduc diluc idluc udilc duilc uidlc iudlc diulc idulc ludci uldci lduci dluci udlci dulci lucdi ulcdi lcudi cludi ucldi culdi ldcui dlcui lcdui cldui dclui cdlui udcli ducli ucdli cudli dculi cduli luicd ulicd liucd ilucd uilcd iulcd lucid ulcid lcuid cluid uclid culid licud ilcud lciud cliud iclud cilud uicld iucld ucild cuild iculd ciuld ldicu dlicu lidcu ildcu dilcu idlcu ldciu dlciu lcdiu cldiu dcliu cdliu licdu ilcdu lcidu clidu icldu cildu diclu idclu dcilu cdilu icdlu cidlu udicl duicl uidcl iudcl diucl iducl udcil ducil ucdil cudil dcuil cduil uicdl iucdl ucidl cuidl icudl ciudl dicul idcul dciul cdiul icdul cidul
Note: these 'words' (valid or invalid) are all the permutations of the word ludic. These words are obtained by scrambling the letters in ludic.