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find difference between dates from a column in oracle

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Last Modified: 2016-08-09
I have this data
Emp#           eff_dt                type       seq_nbr     Expected column
1234            7/18/2011      HIRE      1                null
1234           11/23/2012      TERM      2                 16
1234           9/8/2014              HIRE      3                 21
1234            8/23/2015      TERM      4                 11

i need to add another column which would give me difference between eff_dt in Months.
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