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Write a function that finds and removes the second occurrence of a given string in a passed string.

Note: An answer could make use of a variety of techniques (such as looping through the string in some way), but the easiest way is to make use of the find method and making a substring.

Oracle, IBM DB2, Microsoft SQL Server, Microsoft Access, MySQL, and Sybas are databases based on the _____ model.

Fill in the blank(s) with the appropriate word(s).