Rows to email - each row appends to the PDF

Each row in the spreadsheet produces a PDF - however if adjacent rows in the spreadsheet have the same email address, the PDFs are combined together and only one email with one attachment is sent. This is an advanced example where the 'rows to email' method is 'Each row appends to the PDF attachment'.

This example is the same as One or more certificates of achievement are emailed to each person listed in the spreadsheet except the 'rows to email' setting is 'each row appends to the PDF attachment'.