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## uniqueoccurences
### Instructions
Write a program that outputs `true` if the number of occurrences of each character is unique, otherwise `false`. `\n` should be at the end of the line.
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If number of arguments is not 1 output nothing.
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Only lower case characters will be given.
### Usage
```console
student@ubuntu:~/uniqueoccurences/test$ go build
student@ubuntu:~/uniqueoccurences/test$ ./main abbaac
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true
student@ubuntu:~/uniqueoccurences/test$ ./main ab
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false
student@ubuntu:~/uniqueoccurences/test$ ./main abcacccazb
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true
```
In first example, character 'a' has 3 occurrences, 'b' has 2 and 'c' has 1. No two characters have the same number of occurrences.