<s>
Jape	B-Application
is	O
a	O
configurable	O
,	O
graphical	O
proof	O
assistant	O
,	O
originally	O
developed	O
by	O
Richard	O
Bornat	O
at	O
Queen	O
Mary	O
,	O
University	O
of	O
London	O
and	O
Bernard	B-Application
Sufrin	I-Application
the	O
University	O
of	O
Oxford	O
.	O
</s>
<s>
It	O
is	O
claimed	O
that	O
Jape	B-Application
is	O
the	O
most	O
popular	O
program	O
for	O
"	O
computer-assisted	O
logic	O
teaching	O
"	O
that	O
involves	O
exercises	O
in	O
developing	O
proofs	O
in	O
mathematical	O
logic	O
.	O
</s>
<s>
The	O
program	O
is	O
available	O
for	O
the	O
Mac	B-Device
,	O
Unix	B-Application
,	O
and	O
Windows	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
It	O
is	O
written	O
in	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
and	O
released	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
