<s>
The	O
is	O
a	O
formalism	O
intended	O
to	O
combine	O
the	O
higher-order	O
facilities	O
of	O
lambda	B-Language
calculus	I-Language
with	O
the	O
pattern	O
matching	O
of	O
term	O
rewriting	O
.	O
</s>
