'use strict'
var parse = require('./parse')
var str = require('./str')
/**
* Get a interval from a string (or null if not valid interval)
*
* @name interval
* @function
* @param {String} src - the source
* @return {String} the interval in short notation
*
* @example
* interval = require('music-notation/interval/interval')
* interval('2M') // => '2M'
* interval('2') // => '2M'
* interval('2m') // => '2m'
* interval('2b') // => '2m'
* interval('C') // => null
*/
module.exports = function (n) { return str(parse(n)) }
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