<s>
DUP	O
(	O
DataUnit	B-Language
Processing	I-Language
language	I-Language
)	O
is	O
a	O
special-purpose	O
,	O
interpreted	B-Application
and	O
functional	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
The	O
DUP	O
language	O
looks	O
like	O
a	O
mixture	O
of	O
C	B-Language
and	O
ASN.1	B-Protocol
.	O
</s>
<s>
It	O
borrows	O
its	O
structure	O
from	O
C	B-Language
,	O
while	O
the	O
way	O
of	O
using	O
variables	O
comes	O
from	O
ASN.1	B-Protocol
.	O
</s>
<s>
This	O
makes	O
it	O
intuitive	O
for	O
a	O
programmer	O
used	O
to	O
C/C	O
++	O
and	O
ASN.1	B-Protocol
to	O
use	O
the	O
language	O
.	O
</s>
<s>
The	O
<return type>	O
is	O
one	O
of	O
the	O
ASN.1	B-Protocol
types	O
supported	O
by	O
the	O
application	O
in	O
which	O
is	O
used	O
.	O
</s>
<s>
The	O
<argument type>	O
is	O
an	O
ASN.1	B-Protocol
data	O
type	O
.	O
</s>
