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 <a href="pre_ff.html#K3" title="PRE_FF:func.3">Fib</a> 2 = 
 <a href="pre_ff.html#K3" title="PRE_FF:func.3">Fib</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default">0 <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span>

<br/>.= 
1
<b>by </b><i><a class="ref" href="pre_ff.html#T1" title="PRE_FF:th.1">PRE_FF:1</a></i>
;<br/>
<b>hence </b><a NAME="E2:34"/>
 <a href="pre_ff.html#K3" title="PRE_FF:func.3">Fib</a> 2 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 ;<br/>


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