)give rise to certain specific situations when the notion of eras, as of sequences of Kasner epochs interchanging each other according to the rule , loses its meaning (although the oscillatory mode of evolution of the model still persists).Such an "anomalous" situation can be manifested, for instance, in the necessity to retain in the right-hand side of terms not only with one of the functions "a", "b", "c" (say, "a"4), as is the case in the "regular" interchange of the Kasner epochs, but simultaneously with two of them (say, "a"4, "b"4, "a"2"b"2).