[mendokusa]

normally when there are some something,
ＡとＢとＣがあります。（there are A,B and C.）
like this.
but　when something is too many,
there is に before final thing,it's easy to understand these's end.
this に is meaning of "addition".
A、B、に（加kuwaえて）Ｃがあります。
There is C,besides A and B.

,can use like next,too
Aに、Ｂに、Ｃがあります。
=AとB（とor、）Cがあります。
when checking something,often use this sentence.

hanako:Are you ready?
tadashi;one moment please.
tadashi;財布saihuに、時計(tokei)に、・・・・あっ！メモ帳chouがない！
(wallet,watch,...oh!there is no tickler file!)
hanako:Hurry up!
tadashi;財布、時計、にメモ帳、全部zennbuあるな。よしっ！
(there is tickler file,besids wallet and watch.)
hanako:Let's go!