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I want to merge lines that share common prefix. Example:

a 1
a 2
bc-de 3 4
bc-de 5

After merging:

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I want to merge lines that share common prefix. Example:

a 1
a 2
bc-de 3
bc-de 4
bc-de 5

After merging:

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a-a 12 34 12
a-a-a 56 56
a-ba-ao-ke-luo 78 90 90

Each line is a key values pattern. The key is a string delimited by hyphens. while values delimited by spaces.

I want to remove duplicate vlaues on each line:

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[cplayer] Reading config file /home/zachary/.config/mpv/mpv.conf
[cplayer] Setting option 'no-border' = '' (flags = 4)
[cplayer] Setting option 'ontop' = 'no' (flags = 4)
[cplayer] Setting option 'save-position-on-quit' = 'yes' (flags = 4)
[cplayer] Setting option 'autofit-larger' = '100%' (flags = 4)
[cplayer] Setting option 'profile' = 'pseudo-gui' (flags = 4)
[cplayer] Setting option 'terminal' = 'no' (flags = 4)
libva info: VA-API version 0.38.1
libva info: va_getDriverName() returns 0

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-- deeply compare two objects like 'pl.tablex.deepcompare()'
local function deep_equals(t1, t2, ignore_mt)
    -- different type
    if t1Type ~= t2Type then return false end
    -- compare simple values directly
    if t1Type ~= 'table' then return t1 == t2 end

    -- both table type; try metatable method
    if not ignore_mt then
        local mt1 = getmetatable(t1)

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local function list_iter (t)
   local i = 0
   local n = #t
   return function ()
      i = i + 1
      if i <= n then return t[i] end
   end
end

local t = { 10, 20, 30 }

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-- memory test

local size = 1000000
local t = {}   -- create a table

local function report(title)
  collectgarbage()
  collectgarbage()
  print(title, collectgarbage("count"))
end

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local socket = require("socket")

local host, port = "180.101.50.242", 80
local sock = socket.connect(host, port)
sock:settimeout(1)
sock:send("GET / HTTP/1.1\r\n\r\n")
sock:close()

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local func -- Forward declaration. `local func = nil` is the same.

local function func2() -- Suppose you can't move this function lower.
    return func() -- reference to name, not to its value
end

-- error
print(func2())

function func() -- defined here