#1 数据如下：

in:
64
a
absent
also
always
and
anything
around
as
at
battles
by
caused
city
could
didnt
do
emotion
encouraged
even
eyes
feel
flowing
from
gave
go
he
her
him
his
however
in
invite
it
join
just
looked
mainly
melodies
never
not
on
once
order
pacify
pals
peaceful
played
plays
same
she
shyly
smile
so
sometimes
talked
the
them
then
they
time
to
tricks
was
were

其中 a，at，battles 应能组成一个长为 $3$ 的词链，然而输出是 $2$。

求解答