UNPERFORABLE

ab ae al an ar ba be bo ef el en er fa fe la lo na ne no nu oe of on op or pa pe re un up

abo alb ale alp ane ape apo arb are arf bal ban bap bar bee bel ben boa bop bra bro brr bun bur ear eau eel elf eon era ere ern err fab fan far fee fen fer feu flu fob foe fon fop for fou fro fub fun fur lab lap lar lea lee leu lob lop nab nae nap neb nee nob nor nub oaf oar oba obe ole one ope ora orb ore our pal pan par pea pee pen per pol pro pub pul pun pur ran rap reb ree ref rep rob roe rub rue run upo urb urn urp

able aeon aero alee alef aloe aper bale bane bare barf barn bean bear beau beef been beep beer bene blae blue blur boar bola bole bone bora bore born brae bran bree bren buna bura burl burn burp burr earl earn ebon elan enol enuf erne euro fane fano fare farl faro faun feal fear feeb feel fere fern flab flan flap flea flee floe flop flub flue foal fora forb fore foul four frae frap free froe fuel furl lane leaf lean leap lear leer leno loaf loan lobe lone lope lore lorn loup lour lube luna lune lure nabe nape neap near neep noel nope nurl olea opal open oral orle orra pale pane pare parr peal pean pear peel peen peer pele pelf peon pere plan plea pleb pole pone pore porn pouf pour prao prau pree proa prof pula pule puna pure purl purr rale rape rare real reap rear reef reel repo roan roar robe role rolf rope roue roup rube ruer rule rune ulan ulna unbe upon urea