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Almost paracontact almost paracomplex Riemannian manifolds of the lowestdimension are studied. Such structures are constructed on hyperspheres in4-dimensional spaces, Euclidean and pseudo-Euclidean, respectively. Theobtained manifolds are studied and characterised in terms of the classificationused and their geometric properties.

Hyperspheres in Euclidean and Minkowski 4-spaces as almost paracontact almost paracomplex Riemannian manifolds