Solve with isolates

Not that I'm saying this should be done. Feel free to close out if uninteresting. At the cost of extra memory unrolling the y part of the solve loop with isolates ran a little 'faster'. I'm sure better profiling can be done, I just wanted to exercise isolates here. 

```
172021
[BA, FA, FIE, KNOP, IF, FAB, EF, FINO, NIM, INK, OP, FINK, AB, POL, GLOP, BE, MINK, JIN, LOP, KOJI, NO, FE, FIN, LO, MI, ON, IN, PLONK, KNIFE, JO, JINK, AE, KOP]
Found in 11549 ms
Isolates Found in 8601 ms
[AE, FA, FIE, KNOP, IF, EF, FAB, FINO, NIM, INK, OP, FINK, AB, POL, GLOP, BE, MINK, JIN, KOJI, LOP, NO, FE, FIN, LO, ON, MI, IN, PLONK, KNIFE, JO, JINK, BA, KOP]
Isolates done!
```