<s>
ELAN	B-Language
is	O
an	O
interpreted	B-Application
educational	B-Language
programming	I-Language
language	I-Language
for	O
learning	O
and	O
teaching	O
systematic	O
programming	O
.	O
</s>
<s>
The	O
language	O
design	O
focuses	O
strongly	O
on	O
structured	B-Language
programming	I-Language
,	O
and	O
has	O
a	O
special	O
construction	O
for	O
stepwise	O
refinement	O
,	O
allowing	O
students	O
to	O
focus	O
on	O
top-down	O
design	O
,	O
and	O
bottom-up	O
coding	O
.	O
</s>
<s>
The	O
microkernel	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
Eumel	B-Operating_System
began	O
as	O
a	O
runtime	B-Device
system	I-Device
(	O
environment	O
)	O
for	O
ELAN	B-Language
.	O
</s>
