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var assert = require('assert');class MinStack { constructor() {} push(val) {} pop() {} peek() {} min() {}}try { var minstack = new MinStack(); minstack.push(4); minstack.push(7); minstack.push(3); minstack.push(2); minstack.push(6); var min1 = minstack.min(); minstack.pop(); var min2 = minstack.min(); minstack.pop(); var min3 = minstack.min(); minstack.pop();OUTPUT
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