Text this: Engineering the Mechanics and Thermodynamics of Ti<sub>3</sub>AlC<sub>2</sub>, Hf<sub>3</sub>AlC<sub>2</sub>, Hf<sub>3</sub>GaC<sub>2</sub>, (ZrHf)<sub>3</sub>AlC<sub>2</sub>, and (ZrHf)<sub>4</sub>AlN<sub>3</sub> MAX Phases via the Ab Initio Method