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Help me get the number of items in the table

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Hi all
Help me get the number of items in the table
Lua 5.1
-- https://codereview.stackexchange.com/questions/14236/very-basic-chatbot
local messages = {
 [1] = "Hello stranger!",
 ["name"] = "I'm Bob, the owner of this little shop.",
 ["job"] = "I sell stuff.",
 ["hat"] = {
 [1] = "You like my hat?", 
 ["yes"] = "It's nice I know.",
 ["no"] = "You ...!",
 },
}
local topic = messages;
print(">>",#topic); -- 1
The result is 1
But I need that result be 4
Thank you

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