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JavaScript
var words = [{
'period1': [],
'period2': [],
'period3': [],
'period4': []
}];
words[0]['period1'].push({country : 'bangladesh'});
console.log(words[0]['period1']);
var words = [{
'period1': [],
'period2': [],
'period3': [],
'period4': []
}];
words[0]['period1'].push({country : 'bangladesh'});
console.log(words[0]['period1']);