Write the spectral symbol for the terms of a two-electron system consisting a one `p` electron and one `d` electron.

Explanation

In a system containing a `p` electron and a `d` electron
`S=0,1`
`L= 1,2,3`
For `S=0` we have the terms
`.^(1)P_(1),.^(1)D_(2),.^(1)F_(3)`
For `S=1` we have the terms
`.^(3)P_(0),.^(3)P_(1),.^(3)P_(2),.^(3)D_(1),.^(3)D_(2),.^(3)F_(2),.^(3)F_(3),.^(3)F_(4)`