In this short review paper, the significant and profound impacts of the 5-steps rule have <span style="mso-bookmark:OLE_LINK2;"><span style="mso-bookmark:OLE_LINK1;"><span lang="EN-US" style="line-height: 97%;font-family:;" capt",serif;font-size:11pt;"="" pro="" minion="">been briefly recalled with crystal clear convincingness.</span></span></span>