 Complete the following phrase:  Honda returned to Formula One as an engine supplier in 2015 for the second season of the V6 turbo-hybrid regulations, reviving their relationship with 1980s and 1990s partner McLaren. Hondas power unit was designed around McLarens very tight chassis design and aerodynamic requirements, which they had dubbed their size zero philosophy. Over the 2015 season, the McLaren-Honda package proved to be significantly underpowered and unreliable, and the team finished ninth the constructors championship with fifth place in 