 Python
        Python  
      Pythonで複数条件のクエリを効率的に扱う10のテクニック    
   Python
        Python   HTML
        HTML   PHP
        PHP   Ruby
        Ruby   JS
        JS   HTML
        HTML   Ruby
        Ruby   C++
        C++   Swift
        Swift   COBOL
        COBOL   CSS
        CSS   COBOL
        COBOL   C++
            C++     VHDL
            VHDL     COBOL
            COBOL     Objctive-C
            Objctive-C     Groovy
            Groovy     PHP
            PHP     Verilog
            Verilog     Swift
            Swift     COBOL
            COBOL     Objctive-C
            Objctive-C