Confirmation and Identification

Hello all, today I buy 3 Mammillarias.
The first I think that is a Mammillaria camptotricha Marnier-lapostollei;
the second is dichotomic...is too difficult to identify it...perhaps Mammillaria Surculosa?
the third : on the id card it's written: Mammillaria gracilis rubr. Monstr. What means rubr?
Thank for your patience.

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