Synergy of CO/[CII]/Ly$\alpha$ Line Intensity Mapping with the SKA
  We present the science enabled by cross-correlations of the SKA1-LOW 21-cm
EoR surveys with other line mapping programs. In particular, we identify and
investigate potential synergies with planned programs, such as the line
intensity mapping of redshifted CO rotational lines, [CII] and Ly-$\alpha$
emissions during reionization. We briefly describe how these tracers of the
star-formation rate at $z \sim 8$ can be modeled jointly before forecasting
their auto- and cross-power spectra measurements with the nominal 21cm EoR
survey. The use of multiple line tracers would be invaluable to validate and
enrich our understanding of the EoR.
