The symbols all look different to me. Single strands for the column on the left, two strands for the right. Same colour
used to get a lighter effect using the one strand, heavier for the two strands.
I suggest you give it a try and see. Could it be a single strand half stitch also? Would give a very muted effect.
Right. I also thought the same, but in the chart they do not specify their location. Here I place the graphic to which they belong, just in case one has the complete original and have some extra explanation about it.
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