* Because the old way was horrendously slow, the new way of expiring xlines is very
* very efficient. I have improved the efficiency of the algorithm in two ways:
*
- * (1) There are now two lists of items for each linetype. One list holds permenant
- * items, and the other list holds temporary items (ones which will expire).
+ * (1) There are now two lists of items for each linetype. One list holds temporary
+ * items, and the other list holds permenant items (ones which will expire).
* Items which are on the permenant list are NEVER checked at all by the
* expire_lines() function.
* (2) The temporary xline lists are always kept in strict numerical order, keyed by