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## uniqueoccurences
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### Instructions
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Write a program that outputs `true` if the number of occurrences of each character is unique, otherwise `false`. `\n` should be at the of line.
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If number of arguments is not 1 output `\n`.
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Only lower case characters will be given.
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### Usage
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./main "abbaac"
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true
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student@ubuntu:~/[[ROOT]]/test$ ./main "ab"
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false
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student@ubuntu:~/[[ROOT]]/test$ ./main "abcacccazb"
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true
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```
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In first example, character 'a' has 3 occurrences, 'b' has 2 and 'c' has 1. No two characters have the same number of occurrences.
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