I try to move from (stars are just here to indicate which lines I'm keeping)

```
*2020-12-15 19:10:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 19:20:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 19:30:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
*2020-12-15 19:40:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);100.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 19:50:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);100.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
*2020-12-15 20:00:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm

```

to

```
2020-12-15 19:10:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 19:40:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);100.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 20:00:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm

```

I want to remove the duplicate lines from a group of identical lines without taking into account the date but I don't know how to go about it.
I tried sorting from the second argument but it doesn't take into account the "group" of lines

```
cat <my file> | sort -t";" -k2 -u

```

Give me that

```
2020-12-15 19:40:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);100.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm
2020-12-15 19:10:00;34min 8s (min: 32s; max 34min 8s);normal;4;2;91EECB0E;1us (-24);78.688ms (max: 5s);-50.923ms;103.234ms;25.637ms;70;-5,050ppm

```

Anyone have an idea ?