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... if ( $sum > 310 ) { ... $line =~ s/(.*?)\,(.*?)\,(.*?)\,(.*?)\,(.*?)\,(.*?)/$1\,$2\,$3 +\,$sum3,$5,$6/g; } ...
623192729079,510993192729079,19,volemd,0,133,282051608, 623192728769,510993192728769,19,310,0,118,84950715, ... 622198575655,510992198575655,19,1,0, 623192724589,510993192724589,19,volemd1,0, 622743581281,510992743581281,19,71,0,