variety block yield
a 1 31
a 2 39.5
a 3 30.5
a 4 35.5
a 5 37
b 1 28
b 2 34
b 3 24.5
b 4 31.5
b 5 31.5
c 1 25.5
c 2 31
c 3 25
c 4 33
c 5 29.5