Disagreement on spatial domains was mostly due to the problem of reciprocal pairs, where participants disagreed on whether entities such as e 8 and e 9 in Figure 1 gave rise to a well-formed cluster or not.
a similar case arises with plural disjunctive descriptions of the form λx[p(x)∨q(x)], which are usually realised as coordinate constructions of the form the N' 1 and the N' 2 .