What is this extra と in the sentence?


This is more than likely due to my lack of reading enough Japanese; however,
in this sentence the particles と and に are placed together which I haven't
seen before.

Sentence:

> 一時は観光と買い物 **とに**
> 集中していた外国旅行ツアーも近頃はもっと細かくなって、音楽を聴く旅、城をまわる旅というようにある趣味の目的を持つ旅行計画もできてきた。

Is there an underlying reason for the と in this sentence? Would the sentence
be the same with removing the second と?




You may want to see [a similar question I asked about using
lists](https://japanese.stackexchange.com/questions/3370/does-a-list-
using-%E3%81%A8-end-with-%E3%81%8C).

Bottom line, what you have there is a list of things, `観光と買い物と`, "sightseeing
and shopping".

When listing things, you can put `と` after the end of each word, _or_ you can
put `と` after each item except the last.

In the sentence you offer, the author has opted to put `と` after each listed
item, and then `に` to indicate that the action of focusing, `集中している` is being
directed at all the items in that list collectively.

If I'm not mistaken, `観光と買い物に集中している` would be equally grammatical, but someone
should confirm that.




You may want to see [a similar question I asked about using
lists](https://japanese.stackexchange.com/questions/3370/does-a-list-
using-%E3%81%A8-end-with-%E3%81%8C).

Bottom line, what you have there is a list of things, `観光と買い物と`, "sightseeing
and shopping".

When listing things, you can put `と` after the end of each word, _or_ you can
put `と` after each item except the last.

In the sentence you offer, the author has opted to put `と` after each listed
item, and then `に` to indicate that the action of focusing, `集中している` is being
directed at all the items in that list collectively.

If I'm not mistaken, `観光と買い物に集中している` would be equally grammatical, but someone
should confirm that.

