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Collective flow of protons and negative pions has been studied within themomentum region of $4.2 \div 4.5$ AGeV/c ($E =3.4 \div 3.7$ AGeV) for differentprojectile-target combinations involving carbon and, specifically, He-C, C-C,C-Ne, C-Cu and C-Ta. The data stem from the SKM-200-GIBS streamer chamber andfrom Propane Bubble Chamber systems utilized at JINR. The directed flow ofprotons grows dramatically in the carbon region when the counterpart nucleusgrows in mass between He and Ta. The elliptic proton flow points out of thereaction plane and also strengthens as system mass increases. Within thereaction plane, the negative pions flow in the same direction as protons forthe lighter of the investigated systems, He-C, C-C and C-Ne, and in theopposite direction for the heavier, C-Cu and C-Ta. The Quark-Gluon String Modelreproduces observed changes in the flow with system mass.

Collective Flow of Protons and Negative Pions in Nucleus-Nucleus Collisions at Momentum of $4.2 \div 4.5$ AGeV/c