The Compendium of Caraka 6.4.13

6.4.13

saṃsṛṣṭaliṅgaṃ saṃsargāttriliṅgaṃ sānnipātikam/
ekadoṣānugaṃ sādhyaṃ dvidoṣaṃ yāpyamucyate//

With combined symptoms from combination of two, and with three sets of symptoms when born of all three doshas;
that following a single dosha is curable, that with two doshas is called manageable,