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Introduction\n    - Installation\n    - Running Ruby\n    - Official Documents\n\n\n* [Variables](/variables.md)\n    * What is a variable?\n    * Examples\n   \n \n* [Constants](/constants.md)\n    - What is a constant?\n    - Example\n    - Tips\n\n\n* [Comments](/comments.md)\n    - What is a comment?\n    - Single line comments\n    - Multiline comments\n\n\n* [Strings](/strings.md)\n    - What is a String in Ruby?\n    - Interpolation\n    - Indexing\n    - Common methods\n\n\n* [Numbers](/numbers.md)\n    - Integers\n    - Floats\n    - Operaters\n    - Convert numbers\n  \n  \n* [True, False and Nil](/true_false_nil.md)\n\n\n* [Symbols](/symbols.md)\n    - What is a symbol in Ruby?\n    - Examples\n    - Common methods\n\n \n* [Blocks](/blocks.md)\n    - What is a block in Ruby?\n    - Examples\n    - Variables for block\n\n\n* [Arrays](/arrays.md)\n    - Create an Array\n    - Indexing\n    - Accessing elements\n    - Iteration \n    - Common methods\n\n\n* [Range](/range.md)\n    - 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