MODIFIED: library(ugraphs): renamed transpose/2 to transpose_ugraph/2 to avoid confusion with transpose/2 as it is currently available from library(clpfd), which will probably be moved elsewhere.
MODIFIED: library(ugraphs): renamed transpose/2 to transpose_ugraph/2 to avoid
confusion with transpose/2 as it is currently available from library(clpfd),
which will probably be moved elsewhere.

As library(ugraphs) is not used very much, we expect few compatibility issues.
If you use transpose from library(ugraphs) and wish to remain compatible with
older versions, use

:- if(\+current_predicate(transpose_ugraphs/2)).
transpose_ugraphs(In, Out) :- transpose(In,Out).
:- endif.

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