Ba Duan Jin Qigong #1
How many different versions of the Ba Duan Jin (Eight Pieces of Silk Brocade) Qigong are there? I thought there would be one unique sequence, but today I restarted a practice with the sequence below, from the YouTube video by Judy Young at
I am going to try to compile a set of lists of what I think are different versions of the Ba Duan Jin. I remember each of these exercises, except for the last, which makes me think there are a number of different versions. Does anyone out there have any experience in this or anything to contribute? Thanks.

Preview
1. Warm up, swinging arms
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2. Two hands, upholding the sky
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3. Pulling the bow
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4. Crane spreading its wing
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5. Looking backwards
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6. Left and right swing
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7. Up and down stretch
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8. Diagonal knock
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9. Toe and heel bounce
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This one is new to me. I remember the others, but not this. Hence, the question, how many variations are there?