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State and local teachers' unions said today they will file a lawsuit against the accrediting commission. (Alex Emslie/KQED)

State and local teachers’ unions said today they will file a lawsuit against the accrediting commission. (Alex Emslie/KQED)

State and local teachers’ unions said today they will file a lawsuit against the accrediting commission. (Alex Emslie/KQED)