Dropping missing observations

[Hale Isaac]

I have 5 numeric variables: ed em eg eh en.

Is there anyway to tell Stata to drop any of the variables where the last 12 observations are missing. They all have to be missing i.e. if only 11 observations are missing then we retain that variable?

Edit
*cannot amend title, but should be dropping variables if missing observations.

[Andrew Musau]

Last is ambiguous. Below, I assume the observation number defines this.

foreach var of varlist ed em eg eh en{
    qui count if missing(`var') in -12/l
    if `r(N)'==12{
        drop `var'
    }
}

[Hale Isaac]

Thank you very much Andrew, that has done the job!