String concatenation with Java 8
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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1000100005000075000100000
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"+"0,0020,1314,0629,75417,419
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String#concat0,0020,1142,926,75412,163
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StringBuffer0,00010,0010,0020,0020,003
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StringBuilder0,00010,00010,0010,0010,002
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7n²-7n0,0020,20022022025,00510510511,2614114120,02022022
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6993000700070000175003500003937552500070000700000
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