entrytree_get (e:et) (Loc (n:loc)) | n>0 = entrytree_get et (Loc ((n-1):loc))
entrytree_get (e:et) (Loc (n:loc)) | n>0 = entrytree_get et (Loc ((n-1):loc))
entrytree_get (e:et) (Loc (n:loc)) | n>0 = entrytree_get et (Loc ((n-1):loc))