-local t_insert, t_sort, t_remove, t_concat
- = table.insert, table.sort, table.remove, table.concat;
+local t_insert, t_sort, t_remove, t_concat
+ = table.insert, table.sort, table.remove, table.concat;
+
+local setmetatable = setmetatable;
+local math_random = math.random;
+local pairs, ipairs = pairs, ipairs;
+local tostring = tostring;