Classification of a Class of Almost Completely Decomposable Groups

We concentrate on a block-rigid crq-group X of ring type. It means that Tcr(X] is an antichain and consists only of idempotent types (i.e., the ones which are types of idempotent rational groups, or in other words, can be represented by characteristics, consisting only of O's and oo's, see [3, p. 13], [2, Section 85]).