I told u, selection is random!!
See again,
Upper Class: WL
This WL needs to be cleared first, if not cleared, no Upgradation from 1 level down!!
WL Cleared, AVL 2
Now,...
more... the lower class selection is done randomly, CNF/WL/RAC anyone, but 2 (No RAC offered while upgrading, a CNF getting promotion but RAC would not like it)
2 RAC upgraded, 2 RAC CNFed or 2 WL become RAC
2 CNF upgraded, 4 RAC CNFed or 4 WL can become RAC or 2 WL can become CNF!!
2 WL upgraded, WL goes down & no change in CNF/RAC Configuration!!
ANYTHING!!