function fuzzy = isfuzzy(motif,fuzzypos)
% returns true if motif is fuzzy.  
% fuzzypos is the possible locations of fuzzyness. all other locations
% ignored.

nf = length(fuzzypos);
fuzzy=false;
for j=1:nf
    switch motif(fuzzypos(j))
        case {'A','C','G','T'}
        otherwise
            fuzzy=true;
            return;
    end
end