| System | Components | Description | Electrostatic interaction |
| A | A(±)B(±) | Both sites are ionized | Present |
| B | A(0)B(±) | Site "A" neutralized | Absent |
| C | A(±)B(0) | Site "B" neutralized | Absent |
| D | A(0)B(0) | Both sites neutralized | Absent |
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