According to Catholic Church, what are the wider connotations of the Ninth Commandment?

We read in Mtt 5: 27-28: >You have heard that it was said, ‘You shall not commit adultery.’ But I say to you that everyone who looks at a woman with lust has already committed adultery with her in his heart. The Ninth Commandment states: >Thou shall not covet thy neighbor's spouse. Now, adultery is the illicit relationship between two people, both having separate marital status. Going by Jesus's words in Mtt 5: 28, the Sixth Commandment has the wider connotation of treating lustful look at the neighbor's spouse , as adultery in one's heart. That in a way makes the Ninth Commandment a subset of the Sixth. Is it therefore, possible that by coveting'the Ninth Commandment refers not only to lustful wish but a proactive effort to capture' the other man's wife, as was done by David in the case of Bathsheba ? My question, therefore is: According to Catholic Church, what are the wider connotations of the Ninth Commandment ?