pls need the python code working for this problem, it is based on a Cantera example using opposed-flow diffusion flame example code. i need the answer in steps with descriptions of what the process is about

Generate a flamelet manifold for a rocket combustion simulation. The flamelet approach, is a popular approach to model combustion. Instead of solving the transport equations of all the species, O(10100), flamelet model only requires to solve several (usually 3 ) scalar transport equations are needed. For this project generate a flamelet manifold that can be used by combustion CFD. The goal is to construct a flamelet manifold to take the inputs - mixture fraction mean (Z), mixture fraction variance (Z), and progress variable mean (C), and able to provide the outputs: species mass fractions (Yk ), temperature (T), and density (rho ). For the progress-variable approach, product mass fraction ( y=yCO2+yH2O) was chosen to serve as the progress variable. Inputparametersp=ct,oneatm#pressuretinf=300.0#fuelinlettemperaturetino=300.0#oxidizerinlettemperaturemdot0=0.72#kg/m2/smdotf=0.24#kg/m2/s https://cantera.org/examples/python/onedim/diffusion flame.py.html construct a flamelet manifold based on both GRI-3.0 and GRI-1.2 chemical mechanisms that can achieve the goal above. CANTERA is highly recommended as the basic tool to construct the flamelet manifold and it is suggested to use the "opposed-flow diffusion flame" example provided by CANTERA to simulate each flamelet in the manifold reference 1. Nguyen, T.M., P.P. Popov, and W.A. Sirignano, Longitudinal Combustion Instability in a Rocket Engine with a Single Coaxial Injector. Journal of Propulsion and Power, 2018. 34(2): p. 354-373. 2. Peters, N., Lamniar Diffusion Flamelet Models in Non-Premixed Turbulent Combustion. Progress in Energy and Combustion Science, 1984. 10: p. 319-339. 3. Pierce, C.D. and P. Moin, Progress-variable approach for large-eddy simulation of non- premixed turbulent combustion. Journal of Fluid Mechanics, 2004. 504: p. 7397