  We discuss scattering between a bright soliton and a soliton dimer in coupled
quasi-one-dimensional dipolar Bose-Einstein condensates. The dimer is formed by
each soliton from both tubes due to the attractive inter-layer dipole-dipole
interaction. The dipoles within each tube repel each other, and a stable,
bright soliton is stabilized via attractive contact interactions. In general,
the scattering is inelastic, transferring the kinetic energy into internal
modes of both soliton dimer and single soliton. Our studies reveal rich
scattering scenarios, including dimer-soliton repulsion at small initial
velocities, exchange of atoms between dimer and single soliton and soliton
fusion at intermediate velocities. Interestingly, for some particular initial
velocities, the dimer-soliton scattering results in a state of two dimers. At
large initial velocities, the scattering is elastic as expected.
