  We define a class of topological A-models on a collection of Riemann
surfaces, whose boundaries are sewn together along the seams. The target spaces
for the Riemann surfaces are the Grassmanians Gr_{m_i,n} with the common value
of n, and the boundary conditions at the seams demand that the spaces
C^{m_i}\subset C^n present the orthogonal decomposition of C^n. The whole
construction is a QFT interpretation of a part of Khovanov's categorification
of the sl(3) HOMFLY polynomial.
