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a=>a.filter(w=>w.toLowerCase().match(/[a-z]/g).sort().join``==w)
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a=>a.filter(w=>(w=w.toLowerCase())==w.match(/[a-z]/g).sort().join``)
a=>a.filter(w=>w.toLowerCase().match(/[a-z]/gig).sort().join``==w)
a=>a.filter(w=>w.match(/[a-z]/gi).sort().join``==w)
