<s>
A	O
ply	B-Algorithm
is	O
a	O
layer	O
of	O
material	O
which	O
has	O
been	O
combined	O
with	O
other	O
layers	O
in	O
order	O
to	O
provide	O
strength	O
.	O
</s>
<s>
The	O
number	O
of	O
layers	O
is	O
indicated	O
by	O
prefixing	O
a	O
number	O
,	O
for	O
example	O
4-ply	O
,	O
indicating	O
material	O
composed	O
of	O
4	O
layers	O
.	O
</s>
<s>
The	O
word	O
"	O
ply	B-Algorithm
"	O
derives	O
from	O
the	O
French	O
verb	O
plier	O
,	O
"	O
to	O
fold	O
"	O
,	O
from	O
the	O
Latin	O
verb	O
plico	O
,	O
from	O
the	O
ancient	O
Greek	O
verb	O
πλέκω	O
.	O
</s>
