[SiC]

Let me make some corrections here.

You cannot combine 2 level 2s or 2 level 3s in the same renkei.

level1->level1->level1->level1->level1 etc
that will work
or

level1->level1->level2->level2->level2
this wont work
or

level1->level2->level3->level3->level3
this wont work either

Level1->Level1->Level2
Level1->Level1->Level2->Level3
these will work