Input (grade 13): Ã - tzi had several carbon tattoos including groups of short, parallel, vertical lines to both sides of the lumbar spine, a cruciform mark behind the right knee, and various marks around both ankles.
Output (grade 6): The tattoos were carbon (soot). There were groups of short, parallel, vertical lines to both sides of the lumbar spine, a cross-shaped mark behind the right knee, and various marks around both ankles.