The figure below shows the payoff of an asymmetric butterfly spread. How is this strategy constructed using only call options? Payoff of Asymmetric Butterfly Spread Strategy 10 5 0 5 10 15 20 25 30 O Buy 1 call @ K=10. Sell 2 calls @K=20. Buy 1 call @K=25. Buy 1 call @ K=10. Sell 3 calls @K=20. Buy 2 calls @K=25. Buy 1 call @ K=10. Sell 3 calls @K=20. Buy 3 calls @K=25. Buy 2 calls @ K=10. Sell 3 calls @K=20. Buy 2 calls @K=25