toString per IntSet

// a(c) = { c.els.get(i).intValue() |

0 <= i < c.els.size() }

public String toString ()

{String s = "{";

for (int i = 0; i < els.size() - 1; i++) {

s = s + els.get(i).toString() + ","; }

if (els.size() > 0) {

s = s + els.get(els.size() - 1).toString(); }

s = s + "}";

return (s);}

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