  Earlier work with Robert Gompf and Abigail Thompson classified, via a natural
slope indexed by the rationals, all two-component links which contain the
square knot and from which $(S^1 \times S^2) \# (S^1 \times S^2)$ can be
obtained by surgery. It was argued that a certain family $L_n$ of such links
probably contradict the Generalized Property R Conjecture. Left unresolved was
how the family $L_n$ fits into the classification scheme. This question is
resolved here, in part by giving varied perspectives and more detail on the
construction of the $L_n$.
