def get_bsse_section(natoms_a, natoms_b, mult_a=1, mult_b=1, charge_a=0,
    charge_b=0):
    """Get the &FORCE_EVAL/&BSSE section."""
    bsse_section = {'FORCE_EVAL': {'BSSE': {'FRAGMENT': [{'LIST': '1..{}'.
        format(natoms_a)}, {'LIST': '{}..{}'.format(natoms_a + 1, natoms_a +
        natoms_b)}], 'CONFIGURATION': [{'MULTIPLICITY': mult_a, 'CHARGE':
        charge_a, 'GLB_CONF': '1 0', 'SUB_CONF': '1 0'}, {'MULTIPLICITY':
        mult_b, 'CHARGE': charge_b, 'GLB_CONF': '0 1', 'SUB_CONF': '0 1'},
        {'MULTIPLICITY': mult_a, 'CHARGE': charge_a, 'GLB_CONF': '1 1',
        'SUB_CONF': '1 0'}, {'MULTIPLICITY': mult_b, 'CHARGE': charge_b,
        'GLB_CONF': '1 1', 'SUB_CONF': '0 1'}, {'MULTIPLICITY': mult_a +
        mult_b - 1, 'CHARGE': charge_a + charge_b, 'GLB_CONF': '1 1',
        'SUB_CONF': '1 1'}]}}}
    return bsse_section
