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