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发个证明，嘿嘿。

Posted by 11119999 at 2006-08-12 15:58:11 on Problem 1953 
Proof:

Suppose a is the string.

if a[n]=0;
then a[n]=a[n-1];

if a[n]=1;
then a[n-1] must be 0;
so a[n]=a[n-2];

'Cause a[n]=0 or a[n]=1;
so a[n]=a[n-1]+a[n-2];
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