“…For definitions, results and applications on H v -structures, see books [44], [4], [10], [12] and papers [6], [7], [8], [9], [11], [17], [18], [19], [22], [24], [46]. An extreme class is defined as follows [41], [44]: An H v -structure is very thin iff all hopes are operations except one, with all hyperproducts singletons except only one, which is a subset of cardinality more than one.…”