c# - Split a word into an array of unique letters -

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how split string array of unique characters using c#?

i know code below splits string array, won't pick out unique characters:

string s = "robot"; char[] chararray = s.tochararray(); (int = 0; < chararray.length; i++) {  console.writeline(chararray[i]); }

this done easy linq:

char[] chararray = s.tochararray().distinct().toarray()

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