... but there is a certain amount of joy and amusement to such endeavors, isn&#x27;t there? Why else suffer the rote exercises? For the money?<p>It is a recreation, of a kind, that shouldn&#x27;t be taken for granted even after doing rote derivations for ten hours a day. If you enjoy it that ten hours is rarely enough.<p>That&#x27;s how I interpreted the OP.