Tex: How to use the table methods in Lua

How to use the table methods in Lua
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(tex.stackexchange.com/users/3144/alain-matthes)Alain Matthes
(tex.stackexchange.com/users/6880/projetmbc)projetmbc
(tex.stackexchange.com/users/226445/alexander-mashin)Alexander Mashin
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