<s>
Nesting	B-Algorithm
algorithms	I-Algorithm
are	O
used	O
to	O
make	O
the	O
most	O
efficient	O
use	O
of	O
material	O
or	O
space	O
by	O
evaluating	O
many	O
different	O
possible	O
combinations	O
via	O
recursion	O
.	O
</s>
