<s>
Strategy	B-Application
X	I-Application
( ス卜ラテジーX	O
)	O
is	O
an	O
overhead	O
,	O
vertically	O
scrolling	O
shooter	O
released	O
in	O
arcades	O
by	O
Konami	O
in	O
1981	O
.	O
</s>
<s>
A	O
port	O
to	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
was	O
released	O
in	O
1983	O
.	O
</s>
