With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Istanbul has a population.
text_B: Australian Technical Colleges -LRB- ATCs -RRB- were a class of Australian senior secondary school funded by the Australian federal government between 2005 and 2009 .. secondary. secondary education. Australian federal government. Government of Australia. The Australian Technical College program ceased on 31 December 2009 .. All 24 ATCs were integrated into existing education and training systems -LRB- state / territory government , Catholic and Anglican -RRB- , with some continuing as stand-alone independent schools .. They delivered vocational education courses to Year 11 and 12 students , predominantly 16 - to 18-year-olds .. vocational education. vocational education. Some colleges had a single campus , while others had multiple campuses .
not_related.