My first connect-wall was too easy; here is a hard one, as promised.
There are four categories of five words each:
wetsuit | crystal | blue | lie |
sink | wire | bear | aura |
barcode | marker | swiss | LED |
gate | syrian | airbag | hail |
saga | relay | duck | IC |
Enjoy!
Hints:
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Time to get innovative! (Maybe the clock will be your Bain?)
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You can replace "syrian" with "tulum"
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Wired in by now?