   for letter in 'abcdefghijklmnopqrztuvwxyz0123456789'
     calculate("a-custom-tag-#{letter}")
     calculate("a-custom-tag-#{letter}:last")
+    calculate("a-custom-tag-#{letter}[foo]")
+    calculate("a-custom-tag-#{letter}[foo=bar]")
     calculate("a-custom-tag-#{letter}-#{number}")
     calculate("a-custom-tag-#{letter}:not(.ag#{number})")
 

    calculate(".a-class, .a-custom-class-#{letter}#an-id")

    calculate("#a-custom-id-#{letter}")
    calculate("#a-custom-id-#{letter}:last")
    calculate("#a-custom-id-#{letter}:not(.a-#{number})")
    calculate("#a-custom-id-#{letter}.a-class")

    calculate("body > a-custom-tag-#{letter}#an-id")

    calculate(".a-custom-class-#{letter}")
    calculate(".a-custom-class-#{letter}[foo]")
    calculate(".a-custom-class-#{letter}[foo=bar]")
    calculate(".a-custom-class-#{letter}:last")
    calculate(".a-custom-class-#{letter}:not(.a{number})")
    calculate(".a-custom-class-#{letter}-#{number}")

    calculate(".a-custom-class-#{letter}, body")
    calculate(".a-custom-class-#{letter}-#{number}, body")
