[ ('[')
WHITE_SPACE (' ')
( ('(')
word ('echo')
WHITE_SPACE (' ')
word ('a')
) (')')
WHITE_SPACE (' ')
] (']')
\n ('\n')
[[ ('[[')
WHITE_SPACE (' ')
$ ('$')
( ('(')
< ('<')
WHITE_SPACE (' ')
var ('$1')
) (')')
WHITE_SPACE (' ')
]] (']]')
\n ('\n')
[[ ('[[')
WHITE_SPACE (' ')
$ ('$')
( ('(')
( ('(')
int ('1')
+ ('+')
int ('1')
) (')')
) (')')
WHITE_SPACE (' ')
]] (']]')