async function b(){
const p1 = delayP(3000)
const p2 = delayP (6000)
await Promise.all([p1, p2])
await delayP(9000)
}
new Promise((resolve, reject) =>{
const p1 = delayP(3000)
const p2 = delayP(6000)
return Promise.all([p1, p2])
}).then(()=>{
return delayP(9000)
})
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