I copied the loop below but forgot that I was relying on a side-effect of load_pane_from_file().
WPM6T7ST6XD2YQD4PJ7767JJQRKV5JS6AVO6C4RXIHD4REOGTNEQC
JTDPO5WTXYGCACS6OGKLW4NV2XEDOVZK3UED3FAWCB242ZPGLKWAC
5HOB5Y6ZDNJ42XMHQ7YWZTUCK4DAJRPYRECDWTKFSXZWQ4ZMMSNAC
GQBUV2XOMEPMTXMPCBQWGGIUXGQDX77VTGPFIG6YT7G64ASOYHXQC
initialize_cache_if_necessary(curr)