7)9 elem. in 6 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups5 elements in 3 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups6 elem. in 4 groups9 elem. in 6 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups5 elem. in 3 groups
Lens composition7 elem. in 5 groups 7)9 elem. in 6 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups5 elements in 3 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups6 elem. in 4 groups9 elem. in 6 groups7 elem. in 5 groups8 elem. in 6 groups6 elem. in 4 groups5 elem. in 3 groups