Multi-classing in Swords and Wizardry
(9 is max, but half elf shouldn't be able to get past 8)

Dwarf Fighter/Thief
0,1/1,1
2500,1/2,1
4000,2/2,2
5000,2/3,2
8000,3/3,3
10000,3/4,3
16000,4/4,4
20000,4/5,4
32000,(4,5*)/5,5
40000,(4,5*)/6,5
64000,(4,5,6*)/6,6
80000,(4,5,6*)/7,6
120000,(4,5,6*)/8,6
128000,(4,5,6*)/8,7
180000,(4,5,6*)/9,7
240000,(4,5,6*)/10,7
256000,(4,5,6*)/10,8
480000,(4,5,6*)/11,8
512000,(4,5,6*)/11,9

Elf Fighter/Magic-User
0,1/1,1
4000,2/1,1
5000,2/2,2
8000,3/2,2
10000,3/3,3
16000,4/3,3
20000,4/4,4
32000,(4,5*)/4,4
40000,(4,5*)/5,5
64000,(4,5,6*)/5,5
70000,(4,5,6*)/6,6
100000,(4,5,6*)/7,6
128000,(4,5,6*)/7,7
150000,(4,5,6*)/8,7
200000,(4,5,6*)/(8,9*),7
256000,(4,5,6*)/(8,9*),8
400000,(4,5,6*)/(8,9,10*),8
512000,(4,5,6*)/(8,9,10*),9
600000,(4,5,6*)/(8,9,10*),9

Elf Fighter/Magic-User/Thief
0,1/1/1,1
3750,1/1/2,1
6000,2/1/2,1
7500,2/2/2,2
7500,2/2/3,2
12000,3/2/3,2
15000,3/3/3,3
15000,3/3/4,3
24000,4/3/4,3
30000,4/4/4,4
30000,4/4/5,4
48000,(4,5*)/4/5,4
60000,(4,5*)/5/5,5
60000,(4,5*)/5/6,5
96000,(4,5,6*)/5/6,5
105000,(4,5,6*)/6/6,6
120000,(4,5,6*)/6/7,6
150000,(4,5,6*)/7/7,6
180000,(4,5,6*)/7/8,6
192000,(4,5,6*)/7/8,7
225000,(4,5,6*)/8/8,7
270000,(4,5,6*)/8/9,7
300000,(4,5,6*)/(8,9*)/9,7
360000,(4,5,6*)/(8,9*)/10,7
384000,(4,5,6*)/(8,9*)/10,8
600000,(4,5,6*)/(8,9,10*)/10,8
720000,(4,5,6*)/(8,9,10*)/11,8
768000,(4,5,6*)/(8,9,10*)/11,9
900000,(4,5,6*)/(8,9,10*)/11,9

Half-Elf Fighter/Magic-User
0,1/1,1
4000,2/1,1
5000,2/2,2
8000,3/2,2
10000,3/3,3
16000,4/3,3
20000,4/4,4
32000,5/4,4
40000,5/5,5
64000,6/5,5
70000,6/6,6
100000,6/(6,7*),6
128000,(6,7*)/(6,7*),7
150000,(6,7*)/(6,7,8*),7
200000,(6,7*)/(6,7,8*),7
256000,(6,7,8*)/(6,7,8*),8
400000,(6,7,8*)/(6,7,8*),8
512000,(6,7,8*)/(6,7,8*),9
600000,(6,7,8*)/(6,7,8*),9

Half-Elf Fighter/Magic-User/Cleric
0,1/1/1,1
3750,1/1/2,1
6000,2/1/2,1
7500,2/2/2,2
7500,2/2/3,2
12000,3/2/3,2
15000,3/3/3,3
15000,3/3/4,3
24000,4/3/4,3
30000,4/4/4,4
30000,4/4/(4*),4
48000,5/4/(4*),4
60000,5/5/(4*),5
60000,5/5/(4*),5
96000,6/5/(4*),5
105000,6/6/(4*),6
120000,6/6/(4*),6
150000,6/(6,7*)/(4*),6
180000,6/(6,7*)/(4*),6
192000,(6,7*)/(6,7*)/(4*),7
225000,(6,7*)/(6,7,8*)/(4*),7
270000,(6,7*)/(6,7,8*)/(4*),7
300000,(6,7*)/(6,7,8*)/(4*),7
360000,(6,7*)/(6,7,8*)/(4*),7
384000,(6,7,8*)/(6,7,8*)/(4*),8
600000,(6,7,8*)/(6,7,8*)/(4*),8
720000,(6,7,8*)/(6,7,8*)/(4*),8
768000,(6,7,8*)/(6,7,8*)/(4*),9
900000,(6,7,8*)/(6,7,8*)/(4*),9