It's that time again!

Ready to waste time at work, exercise those brain cells? Here is the Brain Bender via the handy dandy discount MENSA calendar...

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What one three-letter word can be placed in the blanks below to make four different words?

• _____GUIN
• _____ALTY
• _____DING
• _____SIVE

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Okie doke, you know what to do. The answers will be found later in the comments. See you then!