In Chapter 12
"simple repetitive chains" are depicted as
"loops", but this way of diagramming is
dropped again later in the chapter, which reverts
back to an earlier scheme used to depict
"repetitive contingencies" in Chapter 6 (p.
131). The reason for these switches from one
type of diagramming to another is not explained,
nor is a connection between "loops"
and "repetitive contingencies" made explicit.
As we stated before, the emphasis of these
chapters is not on the Mechner notation system;
they serve mainly to present some elementary
material relevant to their titles.