afets faets aefts eafts feats efats aftes fates atfes tafes ftaes tfaes aetfs eatfs atefs taefs etafs teafs fetas eftas fteas tfeas etfas tefas afest faest aefst eafst feast efast afset faset asfet safet fsaet sfaet aesft easft aseft saeft esaft seaft fesat efsat fseat sfeat esfat sefat aftse fatse atfse tafse ftase tfase afste faste asfte safte fsate sfate atsfe tasfe astfe satfe tsafe stafe ftsae tfsae fstae sftae tsfae stfae aetsf eatsf atesf taesf etasf teasf aestf eastf asetf saetf esatf seatf atsef tasef astef satef tsaef staef etsaf tesaf estaf setaf tseaf steaf fetsa eftsa ftesa tfesa etfsa tefsa festa efsta fseta sfeta esfta sefta ftsea tfsea fstea sftea tsfea stfea etsfa tesfa estfa setfa tsefa stefa
Note: these 'words' (valid or invalid) are all the permutations of the word afets. These words are obtained by scrambling the letters in afets.