[scss]each 두번 쓰기

$justify-arr:(
  start :flex-start,
  center :center,
  end :flex-end,
  between :space-between,
  around :space-around,
  evenly :space-evenly,
);
$align-arr:(
  start :flex-start,
  center :center,
  end :flex-end,
);
 
.flex{
  @each $justifyKey,$justifyValue in $justify-arr{
    @each $alignKey,$alignValue in $align-arr{
      &-#{$justifyKey}-#{$alignKey}{
        justify-content: #{$justifyValue}; align-items: #{$alignValue}
      }
    }
  };};