Chicago to Earth Girls Are Easy in 7 Steps

1. Chicago was published by Robin Hood Music Co.
2. Robin Hood Music Co. published I Know
3. I Know was written by Harry Nilsson
4. Harry Nilsson wrote Lay Down Your Arms
5. Lay Down Your Arms is heard in Handgun
6. Handgun was directed by Tony Garnett
7. Tony Garnett produced Earth Girls Are Easy

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