| ⊦ ps=(r, st, r1, st1) ↔ ps=(r1, st1, r, st), cyclic(str, r, st), cyclic(str, r1, st1), junkref(str, r, st), junkref(str, r1, st1) |
ps=(r, st, r1, st1) ⊦ ps=(r1, st1, r, st), cyclic(str, r, st), cyclic(str, r1, st1), junkref(str, r, st), junkref(str, r1, st1)
ps=(r1, st1, r, st) ⊦ ps=(r, st, r1, st1), cyclic(str, r, st), cyclic(str, r1, st1), junkref(str, r, st), junkref(str, r1, st1)
[[CONCRETESIMPRULES : ()]]