Square Out
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From an 8 chain: centers Square Thru 4 while the ends 8 Chain 2 and Square Thru 2.
\syhlines{b4e,g1w,b1e,g2w}
\syhlines{b2n,g1n,b1n,g4n}
4
2
1
3
1
3
2
4
2
4
1
3
1
3
4
2
before Square Out
after
It may be helpful to think "Second hand grand."