Why are there so many loop formulas?

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\begin{bibtex} @article{DBLP:journals/tocl/LifschitzR06, 

 author    = {Vladimir Lifschitz and
              Alexander A. Razborov},
 title     = {Why are there so many loop formulas?},
 journal   = {ACM Trans. Comput. Log.},
 volume    = {7},
 number    = {2},
 year      = {2006},
 pages     = {261-268},
 ee        = {http://doi.acm.org/10.1145/1131313.1131316},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}

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