C# Add Unique Items Together in a Custom Object

Question

I created a custom object that I'm populating with some data. How can I list the total of the same. For example:

dog,dog,dog,cat
dog,dog,dog,cat
dog,dog,dog,dog

I need it to count and produce:

1 each - dog,dog,dog,dog
2 each - dog,dog,dog,cat

---

I try below code:

     var info = new List<SData>();
                    var sinfo = new List<SData>();

                    if (plist.Count > 0)
                    {
                        foreach (P p in plist)
                        {
                            pinfo.Add(new SData
                            {
                                n = p.N,
                                s = p.S,
                                l = p.L,
                                m = p.P
                            });
                        }
                    }