        assert w5 != null : "null w5";<a name="line.173"></a>
<span class="sourceLineNo">174</span>        assert w6 != null : "null w6";<a name="line.174"></a>
<span class="sourceLineNo">175</span>        assert wr != null : "null wr";<a name="line.175"></a>
<span class="sourceLineNo">176</span>        this.wrapper0 = w0;<a name="line.176"></a>
<span class="sourceLineNo">177</span>        this.wrapper1 = w1;<a name="line.177"></a>
<span class="sourceLineNo">178</span>        this.wrapper2 = w2;<a name="lin