What is the formal expression of 住んでんだ


I came to this colloquial expression 住んでんだ from One Piece.




It's contracted from 住んでいるのだ:

[code]

    1.  住んでいるのだ
    2.  住んでいるんだ　　(contract の to ん)
    3.  住んでるんだ　　　(contract ている to てる)
    4. *住んでんんだ　　　(contract る to ん)
    5.  住んでんだ　　　　(reduce double ん to single ん)
    
[/code]

Step 4 isn't a valid sequence; the *んん is not allowed here, so you're forced
to reduce the invalid sequence *んんだ to んだ when you contract る to ん before んだ.

I marked step 4 with a * to show that it's not a valid sequence.




It's contracted from 住んでいるのだ:

[code]

    1.  住んでいるのだ
    2.  住んでいるんだ　　(contract の to ん)
    3.  住んでるんだ　　　(contract ている to てる)
    4. *住んでんんだ　　　(contract る to ん)
    5.  住んでんだ　　　　(reduce double ん to single ん)
    
[/code]

Step 4 isn't a valid sequence; the *んん is not allowed here, so you're forced
to reduce the invalid sequence *んんだ to んだ when you contract る to ん before んだ.

I marked step 4 with a * to show that it's not a valid sequence.

