Hi (1) is casual and it's OK To be more formal, you'd probably put 'for' in, as you have with (3) (2) and (4), I'd say, are not wrong either Dave
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Hi
(1) is casual and it's OK
To be more formal, you'd probably put 'for' in, as you have with (3)
(2) and (4), I'd say, are not wrong either
Dave