oracle query that can filter paired data : I need some help with an oracle query that can skip 'pairs' and only pick non paired data. example

my data is as follows


Id  - cost - hour - type
123	$1.00  1    Input 
123     $1.00  1    Output 

234     $2.00  4    Input
345     $5.00  4    Output

236     $3.00  5    Input
236     $3.00  3    Output


In the above example - only the first one is a 'pair' as the first 3 fields match - in the case of the next 2 - the first three fields data do not exactly match