--------read--------
abc	[0]	1
def	[1,2]	2
abc	[0]	1
def	[1,2]	2
abc	[0]	1
def	[1,2]	2
abc	[0]	1
def	[1,2]	2
--------joinGet--------

abc
def

\N
abc
def


abc
def

\N
abc
def

[0]	1
0
0