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- #!/usr/bin/env perl6
- multi sub fib (Int $n where * == 1) is cached { 1}
- multi sub fib (Int $n where * == 2) is cached { 1}
- multi sub fib (Int $n where * >= 3) is cached { fib($n - 1)
- + fib($n - 2)}
- say fib(17);
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