val universe_eq: NCic.universe -> NCic.universe -> bool
val universe_leq: NCic.universe -> NCic.universe -> bool
val universe_lt: NCic.universe -> NCic.universe -> bool
val universe_eq: NCic.universe -> NCic.universe -> bool
val universe_leq: NCic.universe -> NCic.universe -> bool
val universe_lt: NCic.universe -> NCic.universe -> bool