BEGIN {
    FS=";"
}
{
    col1[NR - 1] = $1
    col2[NR - 1] = $2
    col3[NR - 1] = $3
}
END{
    len = length(col2)
    for (i = 0; i != len; ++i)
    {
        printflag = 1
        for (j = 0; j != len; ++j)
        {
            if (i == j) continue
            else {
                if (col1[j] == col1[i] && col2[j] == col2[i]) {
                    printflag = 0
                    break
                }
            }
        }
        if (printflag == 1) print col1[i] ";" col2[i] ";" col3[i]
    }
}

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YTtiO2QKYTtiO2MKZDtlO2MKZDtlO2EKYztjO2Q=

a;b;d
a;b;c
d;e;c
d;e;a
c;c;d