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 <a href="fib_num3.html#K1" target="_self">Lucas</a> 4 = 
 <a href="fib_num3.html#K1" target="_self">Lucas</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default">1 <a href="nat_1.html#K1">+</a> 1</span>)</span> <a href="nat_1.html#K1">+</a> 1</span>)</span> <a href="nat_1.html#K1">+</a> 1</span>)</span>

<br/>.= 
4 <a href="nat_1.html#K1">+</a> 3
<b>by </b><i>, , </i>
<br/>.= 
7

;<br/>
<b>hence </b><a NAME="E2:19"/>
 <a href="fib_num3.html#K1" target="_self">Lucas</a> 4 <a href="hidden.html#R1">=</a> 7
 ;<br/>


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