<s>
It	O
is	O
similar	O
to	O
the	O
tripolar	B-Protocol
telephone	I-Protocol
plug	I-Protocol
of	O
Italy	O
and	O
also	O
the	O
Swedish	B-Protocol
telephone	I-Protocol
plug	I-Protocol
.	O
</s>
<s>
The	O
article	O
on	O
the	O
Swedish	B-Protocol
telephone	I-Protocol
plug	I-Protocol
details	O
its	O
functional	O
principles	O
.	O
</s>
