12

20

when, and only when, every hook of one of its
spots is joined by a ligature to the corresponding
hook of the other spot. Your object will be as
far as possible to leave no adaptible pair unconjoined,
and if this be impossible, at any rate
to produce every possible combination of conjunctions
in some replica of an evenly
enclosed part of the graph, unless you can
see clearly that nothing would be gained by
a given combination would not serve your
purpose in any degree. In order to do this
you are permitted to perform any of the following
operations upon ligatures, provided that
before performing any a non-reversible
operation you iterate an evenly enclosed

20

when, and only when, every hook of one of its
spots is joined by a ligature to the corresponding
hook of the other spot. Your object will be as
far as possible to leave no adaptible pair unconjoined,
and if this be impossible, at any rate
to produce every possible combination of conjunctions
in some replica of an evenly
enclosed part of the graph, unless you can
see clearly that nothing would be gained by
a given combination would not serve your
purpose in any degree. In order to do this
you are permitted to perform an of the following
operations upon ligatures, provided that
before performing any a non-reversible
operation you iterate an evenly enclosed