' Syntax for each flow:
' SOURCE [AMOUNT] TARGET

' --------------------------------------------------------------------------
' Round 1
' Ana got 25 votes, Ben got 20, Che got 15 and Dan got 10.

' Ana, Ben and Che were not the least voted candidates,
' so they stay for the next round, with all their votes.
Ana r1 [25] Ana r2
Ben r1 [20] Ben r2
Che r1 [16] Che r2

' Dan got the least votes (11) and is eliminated.
' 5 of his voters picked Ana as second choice,
' and 4 picked Ben. None picked Che,
' so these remaining 2 votes (5+4+0+2=11) are discarded.
Dan r1 [5] Ana r2
Dan r1 [4] Ben r2
Dan r1 [2] None r2

' --------------------------------------------------------------------------
' Round 2
' Ana now has 25+5=30 votes, Ben has 20+4=24,
' and Che remains with his original 16 votes.

' Ana and Ben are not the least voted voted candidates,
' so they stay for the next round, with all their votes.
Ana r2 [*] Ana r3
Ben r2 [*] Ben r3

' Che got the least votes (16) and is eliminated.
' 11 of his voters picked Ben as a second choice,
' and 3 picked Ana,
' The remaining 2 votes (11+3+2=15) are discarded.
Che r2 [3] Ana r3
Che r2 [11] Ben r3
Che r2 [*] None r3

' Now there are only two candidates,
' so the one with the most votes wins, i.e. Ben.