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Heather Abbott wears high heels. She always has. It’s harder now with the prosthetic that she needs after the Marathon bombing claimed her left leg. It takes longer getting places. But she will not yield. The same reasoning goes for this year’s Marathon. Since last April, she’s known she wanted to be back at the Marathon. If the bombing had never happened, she might have skipped a year’s attendance. Now it feels like a place she has to be.