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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.
If number of arguments is not 1 output nothing.
Only lower case characters will be given.
### Usage
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./main abbaac
true
student@ubuntu:~/[[ROOT]]/test$ ./main ab
false
student@ubuntu:~/[[ROOT]]/test$ ./main abcacccazb
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.
