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The pattern called for Wrap and turn... Before the rönn cardigan I only tried this technique once and I did it wrong (without noticing) I will have to look the (german, japanese short row) techniques up. I still do not know in which way they are different.
And the I-cord was surpisingly easy... only a bit slower than other bind off techniques and it uses a bit more yarn.

German short rows are more a "turn and pull"-kind of work - VeryPink Knits has a great video (and another one in slow motion).