identity 3 quasigroup 3 parastrophe 2 квазігрупа 2 тотожність 2 05B07 1 08A05; Secondary 05A15 1 20N15 1 39B52 1 Primary 20N05 1 alinear variety 1 alinearity 1 bunch 1 cancellability 1 central 1 functional equation 1 group isotope 1 left 1 linear 1 mediality 1 middle linearity 1 parastrophic orbit 1 parastrophic primary equivalence 1 parastrophic symmetry 1 pseudomediality 1 reducibility 1 right 1 semi-alinear 1 semi-central 1 semi-linear 1