What do these Jeep levers do? Why are there 3?

My 2001 Jeep Cherokee named "The Spool Bus" has a lot of levers. In addition to being manual transmission, it has 3 levers for the transfer case. I have a Behemoth Drivetrain Strongbox underdrive (aka doubler) mated to a flipped Dana 300 which I modified with a Behemoth Drivetrain twin stick flip kit. This video explains how the levers work