Hey!
Hope this helps...
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Yellow: They (in the sentence saying they are completely safe)
Orange: It (in the sentence saying it causes potentially deadly), and It (in the sentence saying they close it behind them)
Blue: Them (in the sentence saying may injure them, or be eaten
Pink: Their (in the first sentence saying their staff), and Their (in the sentence saying their living area)
Green: Itself (in the sentence saying more often fatal to the cat itself)
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Updated: 8:42 pm
Sorry for the delay...