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We introduce the blend of this density practical tight binding (DFT strategy, including onsite correction (OC) and long-range corrected (LC) practical and also the state-interaction state-averaged spin-restricted ensemble-referenced Kohn-Sham (SI-SA-REKS or SSR) method with extensive active area concerning four electrons and four orbitals [LC-OC-DFTB/SSR(4,4)], to research exciton couplings in multichromophoric systems, such natural crystals and molecular aggregates. We use the LC-OC-DFTB/