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When it is no possible to calculate any current due to lack of impedance on a branch (e.g. a voltage source in a branch), there is a supernode. It should make summ of currents on any node, and a supernode must be taken as a "singular node" where currents go in or go out.
When it is no possible to calculate any voltage due to lack of impedance on a branch (e.g. a current source between two real nodes), there is a supermesh. It should make summ of voltages inside any mesh, and a supermesh must be taken as a "singular mesh" where voltages drop out.