Well. It seems I'm stuck. Door behind door "A" require "F" key. Door in the start of the mission require "C" key. Last one, behind "B", require "E" key.
Basic idea goes as "C" must be somewhere behind "B", but I cannot find one here. There is one locked door, that, it seems, require switch of some sort, but there is only one near by + one that act as a press one, but both seems to have no matter here.
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