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+# What is it
+
+A Fibonacci generator that produces a valid Protobuf3 file.
+
+Each message is Fibonacci#, where # is the number in the sequence (i.e. f(#)).
+The field "number" has a field number corresponding to the value of f(#) and a random type.
+
+The field `prevprev` has the type of the message corresponding to f(n-2) and has a field number of the value of f(n-2).
+Similarly, the field "prev" has the type of the message for f(n-1) and the field number of f(n-1).
+
+Fibonacci1 does not have `prevprev`/`prev` because field numbers have to be greater than 0.
+Fibonacci2 does not have `prevprev` for the same reason, while `prev` is omitted because duplicate field numbers are forbidden and f(1) = f(2).
+Fibonacci3 does not have `prevprev` either.
+
+The last sequence number generated is 43, because after that the field numbers become too large and are illegal.
+
+## Running
+With `cargo` installed on your system, `cargo run` will compile and output the protobuf file to stdout.
+
+To verify that the protobuf compiles, something like
+```
+cargo run > fib.proto && protoc -odescriptors.proto fib.proto
+```
+should work. Note that you will need `protoc` to do that.
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