According to the Model Code for Securities Transactions by Directors of Listed Issuers in Hong Kong Listing Rules, what are the main conditions for a “top-up” placing to be exempted from being a dealing?

ID : 1911
Long answer : Exempt if new shares equal sold shares in quantity and price. (Source: https://en-rules.hkex.com.hk/sites/default/files/net_file_store/HKEX4476_3785_VER31169.pdf)
Short answer : Equal shares at the same price.
answer 2 : 10% discount allowed.
answer 3 : Shares held for 2 years.
answer 4 : Board majority approval.