[\lambda z:nat. \lambda h:(le 0 z). (le 0 (S z))]
match (le_S 0 0 (le_n 0)): le with
[ le_n \Rightarrow (le_S 0 0 (le_n 0))
| (le_S x y) \Rightarrow (le_S 0 (S x) (le_S 0 x y)) ]
### (* METASENV after disambiguation  *)

### (* TERM after disambiguation      *)

<[z:nat][h:(le O z)](le O (S z))>Cases (le_S O O (le_n O)) of 
 le_n => (le_S O O (le_n O))
 le_S => [x:nat][y:(le O x)](le_S O (S x) (le_S O x y))
end
### (* TYPE_OF the disambiguated term *)
([z:nat][h:(le O z)](le O (S z)) (S O) (le_S O O (le_n O)))
### (* REDUCED disambiguated term     *)
(le_S O (S O) (le_S O O (le_n O)))