Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
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"If we find out for example, that 60% of our young people are working in really hard physical labour, we will need to make sure that in 20 years time we've invested in physiotherapy," she said.