okay I think I can answer my own question with this data:
transaction/VYWRBV
RZKOLU
MJOTMK
transaction/RZKOLU
USOBTT
MJOTMK
transaction/USOBTT
H9OOFC
MJOTMK
transaction/H9OOFC
MJOTMK
HBDVJA
bundle DFZCQK has 4 transactions: [VYWRBV, RZKOLU, USOBTT, H9OOFC]
tx0 points to RZKOLU (in) and MJOTMK (out)
tx1 points to USOBTT (in) and MJOTMK (out)
tx2 points to H9OOFC (in) and MJOTMK (out)
tx3 points to MJOTMK (out) and HBDVJA (out)
The short answer is, within a bundle you are creating, you might as well approve your own transactions with each other and then go out to some txs outside your bundle at the very end.
Then more info is nonce of each tx:
MA999IWC9999999999999999999
9Z9999PF9999999999999999999
PA9999XG9999999999999999999
VA999IVE9999999999999999999