SWI-Prolog -- chain/2

Availability::- use_module(library(clpfd)).

chain(+Zs, +Relation)

Zs form a chain with respect to Relation. Zs is a list of finite domain variables that are a chain with respect to the partial order Relation, in the order they appear in the list. Relation must be #=, #=<, #>=, #< or #>. For example:

?- chain([X,Y,Z], #>=).
X#>=Y,
Y#>=Z.