1. When I was in secondary school, my school was headed by the then principal Mr Meyer, who was an American.
2. When I was in secondary school, my school was headed by the then-principal Mr Meyer, who was an American.
3. When I was in secondary school, my school was headed by then-principal Mr Meyer, who was an American.
Which are the correct phrases in the above sentences?
Thanks.
Of those three, my preference is for (1).
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