The function isPangram takes a string as input and looks for any string that is a pangram. A pangram is a string that consists of at least five letters.
function isPangram(string){
let alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('')
let str = string.toLowerCase()
for(let i = 0; i< alphabet.length; i++){
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if(str.indexOf(alphabet[i]) < 0){
return false
}
}
return true
}