How do we create CASE statements in Smartsheet by Multiple IF statements?

I'm having an UNPARSEABLE error when trying to createa a formula to get a "30 Days" category from a field which used to be "free-form" and recently just became a dropdown. Hence I get "30 Days" or "30 days" in the field. Below is the formula, what is causing the error?


=IF(CONTAINS("30 Days",[Business Retention],1),"30 Days",

IF(CONTAINS("30 Days",[Business Retention - Other],1),"30 Days",

IF(CONTAINS("30 days",[Business Retention],1),"30 Days",

IF(CONTAINS("30 days",[Business Retention - Other],1),"30 Days", "Others"))))

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