<s>
BNR	B-Application
Prolog	I-Application
,	O
also	O
known	O
as	O
CLP(BNR )	O
is	O
a	O
declarative	O
constraint	B-Application
logic	I-Application
programming	I-Application
language	O
based	O
on	O
relational	O
interval	B-Algorithm
arithmetic	I-Algorithm
developed	O
at	O
Bell-Northern	O
Research	O
in	O
the	O
1980s	O
and	O
1990s	O
.	O
</s>
<s>
BNR	B-Application
Prolog	I-Application
was	O
the	O
first	O
such	O
implementation	O
of	O
interval	B-Algorithm
arithmetic	I-Algorithm
in	O
a	O
logic	O
programming	O
language	O
.	O
</s>
