 \vcenter{\xymatrix@0@!0@R=0.0000em@C=0.0000em{& {\cdot} \ar[rd]^-{\beta}\\ {\cdot} \ar[ru]^-{\alpha} \ar[rr]_-{\gamma} && {\cdot}}} & \mapsto & \vcenter{\xymatrix@0@!0@R=0.0000em@C=0.0000em{& {\cdot} \ar[rd]^-{\beta}\\ {\cdot} \ar[ru]^-{\alpha} && {\cdot}}} \