\left(A_{1, 1}, B_{1, 1}\right), \left(A_{1, 2}, B_{1, 2}\right), ..\left(A_{1, {_{-}a}}, B_{1, {_{-}a}}\right).., \left(A_{1, n}, B_{1, n}\right), \left(A_{2, 1}, B_{2, 1}\right), \left(A_{2, 2}, B_{2, 2}\right), ..\left(A_{2, {_{-}a}}, B_{2, {_{-}a}}\right).., \left(A_{2, n}, B_{2, n}\right), ....\left(A_{{_{-}b}, 1}, B_{{_{-}b}, 1}\right), \left(A_{{_{-}b}, 2}, B_{{_{-}b}, 2}\right), ..\left(A_{{_{-}b}, {_{-}a}}, B_{{_{-}b}, {_{-}a}}\right).., \left(A_{{_{-}b}, n}, B_{{_{-}b}, n}\right)...., \left(A_{m, 1}, B_{m, 1}\right), \left(A_{m, 2}, B_{m, 2}\right), ..\left(A_{m, {_{-}a}}, B_{m, {_{-}a}}\right).., \left(A_{m, n}, B_{m, n}\right)