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function String = RandomString1(n)
% generates a random string of lower case letters of length n
LetterStore = char(97:122); % string containing all allowable letters (in this case lower case only)
String = LetterStore(ceil(length(LetterStore).*rand(1,n)));
function String = RandomString2(n)
% generates a random string of lower case letters of length n
% n must be less than the number of possible letters
% elements of the returned string are exclusive
LetterStore = char(97:122); % string containing all allowable letters (in this case lower case only)
Idx = randperm(length(LetterStore));
String = LetterStore(Idx(1:n));