Bert Huang
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Bert Huang
``` var a1 = ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2']; var a2 = ['A', 'B', 'C', 'D']; a1.concat(a2).sort((a,b)=>a[0] === b[0] ? a.length === b.length ? a.substr(1) - b.substr(1)...