Subscription Packages

I've been tasked with finding  the subscription package types for each person in a list within a given period of time.  Despite working with Tessitura for that last two years, I have yet to master the Gordian knot of table connections that make up a given customer's subscription history.  Would one of you Tessitura veterans be willing to give me hand in laying out the path from T_LIST_CONTENTS.customer_no to TR_PKG_TYPE.description (in terms of what tables are necessary to construct this ridiculous request)?

I'm sure there's some all-powerful document that explains exactly how to do this in our documentation directory on the server, but I'm not very good at making use of that resource, I admit.  Thank you in advance, as always, Tessiturians.

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