UserID <tab> last 2 logins days <tab> last login day
and each seperated by empty line. Example :
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User1 Tuesday Thrusday Saturday

User2 Friday Saturday Monday

User3 Monday Saturday Monday

User4 Wednesday Wednesday Wednesday
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Example of features to be defined in Template file for CRF++ in this case :
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F1:%x[0,0] # feature 1, userID,  row 0 , col 0
F2:%x[0,1] # feature 2, 3rd last login, row 0, col 1
F3:%x[0,2] # feature 3, 2nd last login, row 0, col 2
F4:%x[0,1]/%x[0,2]  # feature 4, a combination of col 1 and col 2