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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 S firstNDigits(int n, S s) { new StringBuilder buf; for (char c : characters(s)) if (isDigit(c)) { buf.append(c); if (l(buf) >= n) break; } ret str(buf); }