AP Invoice Approval Rule based on the Invoice header. Invoice Number

Summary

we have requirements to route AP Invoices for Approval if the Invoice number 'Start with' "ABC" else should Auto Approve

Content

we have requirements to route AP Invoices for Approval if the Invoice number 'Start with' "ABC" else should Auto Approve

we have defined rule 

IF Invoice header.Invoice Number starts with "ABC" 

THEN List Builder = Approval Group

I need to define second rule or condition that would Auto Approve all Invoices where the Invoice Number doesn't start with "ABC"... how I can create a rule for this... I don't find any appropriate condition for that... please ref. to attached screenshot.