Imagine a list of track plays logged by Apple music users across the world.

Given a comma-separated ordered list of these events, of the form:

 user_id, track_id, timestamp

Write a program to compute the most common three-play sequence, and the
number of times that sequence was played on Apple music.
three-play sequence: means which 3 tracks were played in order(one after another) The count of the sequence(not the track itself)

Example input:

[
    "daniel,ShapeOfYou,1519753867",
    "daniel,Perfect,1519753868",
    "martin,ShapeOfYou,1519753869",
    "daniel,Thunder,1519753870",
    "martin,ShapeOfYou,1519753871",
    "martin,Despacito,1519753872",
    "martin,ShapeOfYou,1519753873",
    "martin,Perfect,1519753874",
    "daniel,Despacito,1519753875",
    "martin,Thunder,1519753875"
]

More clarification ( as an example Daniel):
"daniel,ShapeOfYou,1519753867",
"daniel,Perfect,1519753868",
"daniel,Thunder,1519753870",

"daniel,Perfect,1519753868",
"daniel,Thunder,1519753870",
"daniel,Despacito,1519753875",

Example output:

(ShapeOfYou, Perfect, Thunder), 2 ( like which 3 tracks combination appear the most(in order ofcourse).. like t2 can appear anytime in the future after t1 and t3 appears after t1 and t2.. so which 3 combination appears most )

I couldn't solve it! :((