Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
The school band has 30 songs in their repertoire. The band played 5 songs in their first set and 7 in their second set. The band will play 2 songs for their encore. Assuming the band plays through their entire repertoire, how many songs will they play on average in the third and fourth sets?

### Response:
 Kikundi kiliimba nyimbo 5 + 7 = <<5+7=12>>12 katika seti zao mbili za kwanza.
Wana nyimbo 30 - 12 = <<30-12=18>>18 zilizobaki kwa ajili ya seti ya tatu, seti ya nne na onyesho la mwisho.
Kwa kuwa waliimba nyimbo 2 katika onyesho la mwisho, wana nyimbo 18 - 2 = <<18-2=16>>16 za kuimba katika seti ya tatu na ya nne.
Wataimba nyimbo 16 / 2 = <<16/2=8>>8 kwa wastani katika seti ya tatu na ya nne.