User blog comment:Moooosey/dco + decord sequence/@comment-35470197-20191009222350/@comment-35470197-20191011233420

If (All that stuff) means the body "(a+b)[n] = a+(b[n]), a >=b>0, a & b both limit ordinals, a < a+b, b < a+b" of the current rule, then (a,b) is actually unique.