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The exists only one unique solution to this problem. Here is how to solve it-

Draw an arrow moving away from every piece, towards all pieces that the piece can kill. After you are done drawing a the complete network of arrows, connect them in head to tail basis, starting from the knight and ending at the king. There​ will be clues within on how to proceed, like the pawn can kill only the king, so it must kill the king, etc.