<s>
COWSEL	B-Language
(	O
COntrolled	O
Working	O
SpacE	O
Language	O
)	O
is	O
a	O
programming	O
language	O
designed	O
between	O
1964	O
and	O
1966	O
by	O
Robin	O
Popplestone	O
.	O
</s>
<s>
It	O
was	O
based	O
on	O
an	O
RPN	O
form	O
of	O
Lisp	B-Language
combined	O
with	O
some	O
ideas	O
from	O
CPL	B-Language
.	O
</s>
<s>
COWSEL	B-Language
was	O
initially	O
implemented	O
on	O
a	O
Ferranti	B-Device
Pegasus	I-Device
computer	O
at	O
the	O
University	O
of	O
Leeds	O
and	O
on	O
a	O
Stantec	O
Zebra	O
at	O
the	O
Bradford	O
Institute	O
of	O
Technology	O
;	O
later	O
,	O
Rod	O
Burstall	O
implemented	O
it	O
on	O
an	O
Elliot	O
4120	O
at	O
the	O
University	O
of	O
Edinburgh	O
.	O
</s>
<s>
COWSEL	B-Language
was	O
renamed	O
POP-1	B-Language
during	O
the	O
summer	O
of	O
1966	O
and	O
development	O
continued	O
under	O
that	O
name	O
from	O
then	O
on	O
.	O
</s>
<s>
Popplestone	O
used	O
a	O
Flexowriter	B-Application
with	O
underscoring	O
for	O
syntax	O
highlighting	O
.	O
</s>
