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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 L deltas(L l) { int n = l(l); new L deltas; for (int i = 0; i < n-1; i++) deltas.add(l.get(i+1)-l.get(i)); ret deltas; }