If doesnt start with condition in Offer Letter

Summary:

If doesnt start with condition in Offer Letter

Content (please ensure you mask any confidential information):

I have successfully written a condition that looks at an attribute that starts with

<?if:starts-with(ASSIGNMENT_CATEGORY,'Next')?>

However I cannot seem to find a way of writing 'IF DOESNT START WITH'

Would anyone have the logic to write this

Version (include the version you are using, if applicable):

24C

Code Snippet (add any code snippets that support your topic, if applicable):