initialising variables
let a = 1 ; let b = 2 ; let c = 3 ; let d = 4 ; document . write ( " " + " " ) ; document . write ( " " + a + " " ) ; document . write ( " " + b + " " ) ; document . write ( " " + c + " " ) ; document . write ( " " + d + " " ) ; document . write ( " " + " " ) ;