How to maintain 4:1 leverage overnight?

say on the fourth day, you do nothing. can you hold the 4:1 overnight again even though your SMA is at $25K?

what if on the fourth day, you sold $50K of stocks and replaced it with a different $50K of stocks. you are still at 4:1. can you hold this overnight?
 
SMA is not reduced until you put on new positions or withdraw cash.

If you closed 50k in the first stock you would receive a 25k credit to SMA. The new purchase of 50k in stock would reduce SMA by 25k. No net change.
 
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