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We argue that in many physical calculations where the "eliptic" sectors areinvolved, one can express the results via iterated integrals with almost allweights being rational. Our method is based on the existence of$\epsilon$-regular basis, which is akin to the $\epsilon$-finite basis definedin Ref. [hep-ph/0601165]. As a demonstration of our technique, we calculate thephoton contribution to the total cross section of the production of two $Q\barQ$ pairs in the electron-positron collisions.

$\epsilon$-regular basis for non-polylogarithmic multiloop integrals and total cross section of the process $e^+e^-\to 2(Q\bar Q)$