<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><div><font face="'times new roman', 'new york', times, serif">Hello. There is a code below and I couldn't understand it myself. Could you help me with that please? I especially have no idea about "</font><font face="'times new roman', 'new york', times, serif">data Tree alpha = Empty | </font><span style="font-family: 'times new roman', 'new york', times, serif; ">Node </span><span style="font-family: 'times new roman', 'new york', times, serif; ">" part.</span></div><div><font face="'times new roman', 'new york', times, serif"><br></font></div><div><font face="'times new roman', 'new york', times, serif"><br></font></div><div><font face="'times new roman', 'new york', times, serif">data Tree alpha = Empty | </font><span style="font-family: 'times new roman', 'new york', times, serif; ">Node ( alpha
,Tree alpha , Tree alpha )</span></div><div><font face="'times new roman', 'new york', times, serif">x = Node (1,Node (2,Empty ,Empty),Node(3,Empty ,Empty))</font></div><div><font face="'times new roman', 'new york', times, serif">y = Node(3,Empty ,Empty)</font></div><div><font face="'times new roman', 'new york', times, serif"><br></font></div><div><font face="'times new roman', 'new york', times, serif">Thanks in advance</font></div></div></div></body></html>