Question: and where a theorem may present some problem, he may always look down to the numerical examples for help.
Answer: --> And where a theorem may present some problem, he may always look down to the numerical examples for help.

Question: an engaging and intriguing presentation
Answer: --> An engaging and intriguing presentation

Question: excluded classes and fields in statement.statementline.billingreference
Answer:
--> Excluded classes and fields in Statement.StatementLine.BillingReference