From the list given below, type the correct answer in the spaces provided
HINT: fire, screams, written messages, smoke, runners, horn blowing, drum beats.
1. Could not work during the wet season.
2. Message could not be sent over a wide area.
3. Limited to literate people.
4. Could not be used at night .
5. Slow and time consuming .
6. Requires experts .
7. Message could be disrupted by strong winds .
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