DavidKok, on 2025-December-30, 17:22, said:
4=4=0=5', the ugly duckling hand type for this system.
In fact, for some years a guy and I played a Blue Club variant with 4-card majors (but only if < 15 hcp) and 12-14 1NT (but with no major). And we played 6+ 2♣. That threw quite a lot into 1♦ in theory. But if 1♦ was balanced or had a major it had to be 15-17 (15-16 if unbalanced). So 4=4=0=5 with 15-16 had to be 1♦. My partner never quite faced up to that. Of course that hand never came up.
It was fun to play.

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