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Warning: session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /var/www/tb-usercake/models/config.php on line 51
static double totalLengthOfDoubleRanges(Iterable l) {
double sum = 0;
fOr (DoubleRange r : l) sum += r.length();
ret sum;
}