bash - moving files in subdirectories up one (and *only* one) level -

i trying move files nested in subdirectories 1 level. in os x terminal, , new bash. i'm simple, don't know how it.

i want change file structure looks this:

~/container        /1-a            level 1 - 000.jpg            level 1 - 001.jpg            level 1 - 002.jpg        /1-b            /2-a                level 2 - 007.jpg                level 2 - 008.jpg                level 2 - 009.jpg        /1-c            level 1 - 003.jpg            level 1 - 004.jpg            level 1 - 005.jpg            level 1 - 006.jpg        /1-d            /2-c                level 2 - 010.jpg                level 2 - 011.jpg                level 2 - 012.jpg                level 2 - 013.jpg                level 2 - 014.jpg        /1-e            level 1 - 015.jpg            level 1 - 016.jpg            level 1 - 017.jpg        /1-f            /2-b                /3-a                    level 3 - 018.jpg                    level 3 - 019.jpg                    level 3 - 020.jpg                    level 3 - 021.jpg 

to 1 looks this:

~/container        /1-a            level 1 - 000.jpg            level 1 - 001.jpg            level 1 - 002.jpg        /1-b            level 2 - 007.jpg            level 2 - 008.jpg            level 2 - 009.jpg            /2-a        /1-c            level 1 - 003.jpg            level 1 - 004.jpg            level 1 - 005.jpg            level 1 - 006.jpg        /1-d            level 2 - 010.jpg            level 2 - 011.jpg            level 2 - 012.jpg            level 2 - 013.jpg            level 2 - 014.jpg            /2-c        /1-e            level 1 - 015.jpg            level 1 - 016.jpg            level 1 - 017.jpg        /1-f            /2-b                level 3 - 018.jpg                level 3 - 019.jpg                level 3 - 020.jpg                level 3 - 021.jpg                 /3-a 

i have tried:

find ~/container  -mindepth 3 -type f -exec mv {} . \; 

and

find ~/container  -mindepth 3 -type f -exec mv {} .. \; 

but these move files in relation root directory, not directory file in. in other words, move files far up. want them move 1 level, nested begin with.

can help?

this should solve problem:

find ~/container -mindepth 3 -type f -execdir mv "{}" ./.. \; 

description:
find ~/container search inside folder.
-mindepth 3 show files 3 directories down.
-type f show files (not directories).
-execdir execute following command on each file inside directory.
mv "{}" ./.. move file 1 directory up.
\; repeat new command each file selected.