Extract cells (based on text contained) into left column (left and up) in front of data

Hi I have data organised in 1 column in this way:

acc1
acc2
tr1 (summary line)
acc1
acc4
acc5
acc6
tr2 (summary line)
acc2
acc3
tr3 (summary line)

There always is a summary line after group of "acc". However there always is different counts of "acc". The data is downloaded from another application so I can't work with the groups or subtotals. It's raw data.

And I want to get it shaped into 2 columns like this:

tr1; acc1
tr1; acc2
tr1; tr1 (summary line)
tr2; acc1
tr2; acc4
tr2; acc5
tr2; acc6
tr2; tr2 (summary line)
tr3; acc2
tr3; acc3
tr3; tr3 (summary line)

...so that the 'summary title' is sitting in the cell left to 'acc' for each 'acc'.

I would like to avoid filter and copy-paste and fill. I would like to have one easy formula or one easy step.
Is there some easy step how to do it?
Thank you.

Attach a sample workbook (not image).

Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate.

Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data.

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Thank you for very easy and quick solution! This is exactly what I was looking for. Great. Thank you. P.