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The Standard Model is based on three neutrino flavours where neutrinos mix by unitary matrix PMNS. However, there can exist additional number of neutrinos hidden within our mathematical and experimental benightedness. We propose an independent analysis of neutrino mixing data based on interval matrices. Methods of matrix analysis show that the set of physically admissible mixing matrices are classified as contractions lying within the convex hull of the experimentally determined PMNS matrices.doi:10.5281/zenodo.1300485 fatcat:2tzyfgot7bh5fdjrcepepk63je