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^a:a1[]: a1<br />
^a:a2[]: a2<br />
^a:a3[]: a3<br />
^b:b1[]: b1<br />
<hr />
^a:a1[]: new a1<br />
^a:a2[]: exception: undefined method <b>a2</b><br />
^b:b1[]: b1<br />
^c:c1[]: c1<br />