<s>
ABC	B-Language
ALGOL	I-Language
is	O
an	O
extension	O
of	O
the	O
programming	O
language	O
ALGOL	B-Language
60	I-Language
with	O
arbitrary	O
data	B-General_Concept
structures	I-General_Concept
and	O
user-defined	O
operators	O
,	O
intended	O
for	O
computer	B-Algorithm
algebra	I-Algorithm
(	O
symbolic	B-Algorithm
mathematics	I-Algorithm
)	O
.	O
</s>
