<span class="searchmatch">perdifficilibus</span> dative/ablative masculine/feminine/neuter plural of perdifficilis...
perdifficilī <span class="searchmatch">perdifficilibus</span> accusative perdifficilem perdifficile perdifficilēs perdifficilīs perdifficilia ablative perdifficilī <span class="searchmatch">perdifficilibus</span> vocative...