High-yield Syntheses Of Dilithio-derivatives Of Furan, Thiophen, N-methylpyrrole, 3-methylfuran, And 3-methylthiophen. Application Of The Method To 2-methylfuran, 2-methylthiophen, 2,5-dimethylfuran, 2,5-dimethylthiophen, Benzo[b]furan, Benzo[b]thiophen, Pyrrole, And Indole