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Ceiling Button Challenge Level 0 Portals

Alright so I've been going through the challenge levels and trying to figure them out myself by learning glitches and going as far as I can without looking up solutions, I understand that Ceiling button requires a CFG, however in this particular level it seems significantly harder to execute one than any other time I've used it. I used it in portal reloaded for the last couple levels, any tips on doing it on ceiling button?