Trying to make a doily for an antique table. First 9 rounds were fine but do not understand the 10th one. 10th rnd: Sl st in next tr, ch 4, tr in next 3 tr, * tr in next ch, ch 3, skip 1 tr, tr in next 4 tr, tr in next ch. Ch 3, skip 1 tr, tr in next 3 tr, (ch 3, skip 2 ch, tr in next ch, tr in next 4 tr) twice; ch 5, s c in next loop, ch 5, skip 1 tr, tr in next 4 tr. Repeat from * around. Join. Guess I should include the round before. 9th rnd: Sl st in next sp, ch 4, 4 tr in same place as last sl st, * (ch 3, 5 tr in next sp) 4 times; ch 5, 5 tr in next sp. Repeat from * around. Join last ch-5 with sl st to 4th ch of ch-4. Hereafter pick up only the back loop of each tr throughout. Don't understand where the loop is. Anyone good at crocheting that can interpret for me?