UPGRADEABILITY

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aal aba aby aga age aid ail air ait ala alb ale alp alt ape apt arb are art ate aye baa bad bag bal bap bar bat bay bed beg bel bet bey bid big bit bra bud bug bur but buy bye dab dag dal dap day deb del dey dib die dig dip dit dry dub due dug dui dup dye ear eat eau eld era erg eta gab gad gae gal gap gar gat gay ged gel get gey gib gid gie gip git gul gut guy gyp ire lab lad lag lap lar lat lay lea led leg lei let leu ley lib lid lie lip lit lug lye pad pal par pat pay pea ped peg per pet pia pie pig pit piu ply pry pub pud pug pul pur put pya pye rad rag rai rap rat ray reb red reg rei rep ret ria rib rid rig rip rub rue rug rut rya rye tab tad tae tag tap tar tau tea ted teg tel tie til tip try tub tug tui tup tye urb urd urp uta ute yag yap yar yea yep yet yid yip yup

abed abet able ably abri abut abye adit aery agar aged ager agly ague aide airt airy alae alar alba alga alit aped aper area aria arid aril arty aryl atap auld aura baal bade bail bait bald bale bard bare bate baud bead bear beat beau bedu belt berg beta bide bidi bier bile bird birl bite blae blat bled blet blip blue blur brad brae brag brat bray bred brie brig brit brut bura burd burg burl burp bury bute byre byrl byte dale darb dare dart data date daub daut deal dear debt deil deli delt dial diel diet dipt dire dirl dirt dita dite drab drag drat dray dreg drib drip drub drug dual duel duet duit duly dupe dura dure duty dyer earl edgy edit egad egal etui eyra gaby gadi gaed gait gala gale gape gapy garb gate gaud gaur gear geld gelt geta gibe gied gild gilt gird girl girt gite glad gled gley glia glib glue glut grab grad grat gray grey grid grip grit grub grue guar gude guid gulp gybe gyre gyri idea idle idly idyl iglu ilea ilia ired irid lade lady laid lair lard lari late lati latu laud lead leap lear lept leud liar lied lier lieu lipa lipe lira lire liri lite litu lube lude luge lure lute lyre padi page paid pail pair pale paly para pard pare part pate paty peag peal pear peat pelt peri pert pial pied pier pile pili pily pita pity plat play plea pleb pled plie plug prat prau pray prey prig ptui pula pule puli pure puri purl pyre raga rage ragi raia raid rail rale rape rapt rate raya read real reap rely rial ride riel rile ripe rite rube ruby rude rued ruga rule ruly tabu tael tail tala tale tali tapa tape tare tarp teal tear tela tepa tide tidy tied tier tile tipi tire tirl trad trap tray trey trig trip true trug tuba tube tule turd tyer type tyre ugly upby urea urge yagi yald yard yare yaud yaup year yeld yelp yeti yipe yird yuga yule yurt