MODIFIED: subsets on oset_power/2 are not proper odered sets.  Jacco van Ossenbruggen.
MODIFIED: subsets on oset_power/2 are not proper odered sets.  Jacco
van Ossenbruggen.

edechter/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,mndrix/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,jn7163/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel