in a similar way through an appropriate quotient of the $SL(2, R)$ WZW model[@bertotti]. The solutions that we construct have specific gauge fields and antisymmetric tensors needed in order to have a CFT. In some cases, however, one may $T$-dualize the solution to obtain a new one with the same spacetime geometry but field strengths which are not the canonical ones from the CFT point of view. This form of the solution is sometimes more natural from the M-theory point of view.

The developments in the last few years suggest that the basic solutions of $11d$ SUGRA, namely the membrane (M2), the fivebrane (M5), the wave (W) and the Kaluza-Klein monopole (KK) solution may form a “basis” in the space of all solutions of $11d$ SUGRA. I.e. one may eventually obtain all solutions by appropriate (extremal or non-extremal) intersections of the basic ones, dimensional reduction and use of dualities. In support of this supposition we shall present intersecting brane configurations that correspond to the new solutions. These intersections are obtained by appropriately combining solutions built according to the “standard” intersection rules[@PT; @Tse1] with the solution of [@khuri; @GKT]. In this way we obtain supersymmetric solutions that contain up to 6 