Chain structure can be made by joining two eyes of a chain with a third one.
Eye is the same pattern played twice in distance of 3 places, so there is two places of gap between:
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1..1
How to join patterns:
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1..1 - first eye of patterns
2..2 - 2nd eye
3..3 - 3rd eye
eyes 1 and 3 linked by 2:
1..13..3
2..2
It may go really complex further:
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1..13..35..57..7
2..24..46..6
In a straight line it looks like this:
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1.213243546576.7
And you can loop the structure in a circle with another eye:
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1821324354657687
I wish you happy eyeing!