OPEN_QUOTE ('"')
$ ('$')
( ('(')
WHITE_SPACE (' ')
OPEN_QUOTE ('"')
STRING_CONTENT ('echo')
CLOSE_QUOTE ('"')
WHITE_SPACE (' ')
) (')')
CLOSE_QUOTE ('"')
\n ('\n')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
WHITE_SPACE (' ')
( ('(')
WHITE_SPACE (' ')
OPEN_QUOTE ('"')
CLOSE_QUOTE ('"')
WHITE_SPACE (' ')
OPEN_QUOTE ('"')
CLOSE_QUOTE ('"')
WHITE_SPACE (' ')
) (')')
WHITE_SPACE (' ')
) (')')
CLOSE_QUOTE ('"')
\n ('\n')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
WHITE_SPACE (' ')
( ('(')
WHITE_SPACE (' ')
OPEN_QUOTE ('"')
CLOSE_QUOTE ('"')
WHITE_SPACE (' ')
) (')')
) (')')
CLOSE_QUOTE ('"')
\n ('\n')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
WHITE_SPACE (' ')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
WHITE_SPACE (' ')
word ('echo')
WHITE_SPACE (' ')
) (')')
CLOSE_QUOTE ('"')
WHITE_SPACE (' ')
) (')')
CLOSE_QUOTE ('"')
\n ('\n')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
OPEN_QUOTE ('"')
$ ('$')
( ('(')
OPEN_QUOTE ('"')
STRING_CONTENT ('abcd')
CLOSE_QUOTE ('"')
) (')')
CLOSE_QUOTE ('"')
) (')')
CLOSE_QUOTE ('"')