That is not difficult to see: kama (sensual desires) --> sensual becoming (mainly preoccupied with the alluring "strands of sensuality" through the five senses); rupa-raga (passion for refined forms) --> form becoming (on the level of jhana or the deva realms); arupa-raga (passion for formless states) --> formless becoming (the formless spheres).
Kiṃkusalagavesī anuttaraṃ santivarapadaṃ pariyesamāno... (MN 26)
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