* Front to Middle requires 3 keys, or only 2 if the back is inaccessible
* Middle to Front requires 4 keys, or only 2 if the back is inaccessible and the TR Big Key is in the front
* Back to Middle requires 0 keys
* Middle to Back requires 3 keys
TR will violate 100% locations accessibility if it is only accessible via the middle section - this is required to have enough keys for the rest of the dungeon.
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