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fib
(
0
)
=
1
fib
(
1
)
=
1
fib
(
N
)
=
fib_help
(
1
,
1
,
N
-
2
)
fib_help
(
A
,
B
,
0
)
=
A
+
B
fib_help
(
A
,
B
,
N
)
=
fib_help
(
B
,
A
+
B
,
N
-
1
)