a=pan,b=pan,sum=1
a=pan,b=wye,sum=10
a=eks,b=pan,sum=2
a=eks,b=wye,sum=4
a=eks,b=zee,sum=7
a=wye,b=wye,sum=3
a=wye,b=pan,sum=5
a=zee,b=pan,sum=6
a=zee,b=wye,sum=8
a=hat,b=wye,sum=9
