List 5 customers in the West region who had their item shipped 'Second Class.'
shipped 'Second Class.' refers to "Ship Mode" = 'Second Class'; customers refers to "Customer Name"; Region = 'West'
SELECT DISTINCT T2.`Customer Name` FROM west_superstore AS T1 INNER JOIN people AS T2 ON T1.`Customer ID` = T2.`Customer ID` WHERE T1.Region = 'West' AND T1.`Ship Mode` = 'Second Class' LIMIT 5