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let str = ["eat","tea","tan","ate","nat","bat"];
var res={}
let key1 =1;
let key2 =2;
res[key1] =new Array();
res[key2] =new Array();
for (let words in str){
res[key1].push(str[words])
res[key2].push(str[words])
}
console.log(res)
/**
{
'1': [ 'eat', 'tea', 'tan', 'ate', 'nat', 'bat' ],
'2': [ 'eat', 'tea', 'tan', 'ate', 'nat', 'bat' ]
}
**/