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Basic ideas of muon tracker technique for the solution of primary cosmic ray(PCR) composition problem in the energy range $10^{17}-10^{18}$ eV arepresented. The approach uses MC simulation data made with CORSIKA6.990 for"Pamir-XXI" site conditions. Similar technology can certainly be developed forother observation levels and interaction models. One can probably extend it tomuch higher primary energies.

How to deal with PCR composition problem at $E_0 \gtrsim 10^{17}$ eV