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var assert = require('assert');function validateSymbols(str) { // implement this method return str;}try { assertIsFunction(validateSymbols); console.log('PASSED: ' + '`validateSymbols` is a function');} catch (err) { console.log(err);}try { assert.equal(validateSymbols('[]'), true); console.log('PASSED: ' + "`validateSymbols('[]')` should return `true`");} catch (err) { console.log(err);}try { assert.equal(validateSymbols('{{[]}}'), true); console.log('PASSED: ' + "`validateSymbols('{{[]}}')` should return `true`");OUTPUT
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