const findTheUsable = (data) => {
    // const usableArray = data.map(user=>user.usable).flat()

    // your code ends here
    return data.filter(user=>user.usable.filter((key)=>{
        let acc = {}
        if(Object.keys(user).includes(key)){
            acc[key] = user.key
        }
        return acc
    }))
  }