TAKEN FROM 'HOW TO MAKE A MISSION' ARTICLE - SHANEICE

Mandatory keywords
These are keywords that your ambassadors must include in their post in order for them to successful complete the mission. If the mandatory keywords are not added by the ambassador, you will not see their submission as it is not completed correctly. Enable this option here and you will be prompted to add the keywords in the next step. Add one key word per line so that the ambassadors can freely create their caption and add your keywords naturally. You'll also be asked if you want to enable the 'Mission must have a unique Keyword' option. 

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