How can I specify the range to read with Invoices and Receipt Beta

How can I specify the range to read?

what I did

I read this articles, downloaded sample and tried reading Receipt.

what I want to do

What I want to do is to read a specific item for each form.

But if I don’t specify a range, I won’t get the expected result.
I couldn’t understand how I can specify the range to read.

Can someone tell me?

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