| st ⊆ st0, ∃ refs. dups(refs) ∧ refs .first = r ∧ validrefs(str, refs, st[r -- _type] .type, st) ⊦ junkref(str, r, st), cyclic(str, r, st0) |
st ⊆ st0, dups(refs), validrefs(str, refs, st[refs .first -- _type] .type, st) ⊦ junkref(str, refs .first, st), cyclic(str, refs .first, st0)
[[CONCRETESIMPRULES : ()]]