Holmes Cleaning Service began operation on January $1,$ Year $1.$ The company experienced the following events for its first year of operations:

Provided $$84,000$ of cleaning services on account.

Provided $$16,000$ of cleaning services for cash.

Collected $$76,000$ cash from Accounts Receivable.

Paid salaries of $$28,500$ for the year.

Adjusted the accounts to reflect management's expectations that Uncollectible Accounts Expense would be $2\%.$ The expense was determined using the percent of revenue method.

Wrote off uncollectible accounts of $$1,500.$

Collected $$1,000$ cash from Accounts Receivable that was written off in #$6.$

Which event results in a debit to Uncollectible Accounts Expense and a credit to Allowance for Doubtful Accounts?

Enter only the event number $($ie$.,1-7)$