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

### Instruction:
 Steven, Stephanie, na Sonya walikwenda kucheza mchezo wa kukimbia kwenye barafu. Steven alijiangusha mara 3 tu, lakini Stephanie alijiangusha mara 13 zaidi ya Steven. Ikiwa Sonya alijiangusha mara 2 chini ya nusu ya idadi ya mara Stephanie alijiangusha, Sonya alijiangusha mara ngapi?


### Response:
 Stephanie alijiangusha mara 13 + 3 = <<13+3=16>>16.
Nusu ya idadi ya mara Stephanie alijiangusha ni 16/2 = <<16/2=8>>8.
Sonya alijiangusha mara 8 - 2 = <<8-2=6>>6.