Association of Heads of Independent Girls' Schools
Established in 1916 as The Association of Head Mistresses of New South Wales , the Association that as of 2017 comprised 31 member schools , enables inter-school aesthetic , cultural and sporting activities ( through the Independent Girls' Schools Sporting Association ) between New South Wales and the Australian Capital Territory's most exclusive independent and Catholic girls' schools . 
<triplet> Australian Capital Territory <subj> New South Wales <obj> enclave within