<s>
The	O
Japanese	B-General_Concept
M-1	I-General_Concept
cipher	I-General_Concept
machine	I-General_Concept
was	O
a	O
mechanical	O
device	O
the	O
Japanese	O
used	O
for	O
performing	O
cryptography	O
sometime	O
during	O
the	O
1930s	O
.	O
</s>
