1 | 11. u: Term 12. v: Term List 13. F:Top.
list_accum(x,t.x([[t]] 1of(e) s a tr);F;v) ~ list_accum(x,t.x([[t]] 1of(e) s a tr);F;map( t.
unprime(t);v)) F:Top.
list_accum(x,t.x
([[t]] 1of(e) s a tr);F
([[u]] 1of(e) s a tr);v) ~ list_accum(x,t....;F
(...);map( t.
unprime(t);v)) |