Task: Cheryl's birthday
Go: package main

import (
    "fmt"
    "time"
)

type birthday struct{ month, day int }

func (b birthday) String() string {
    return fmt.Sprintf("%s %d", time.Month(b.month), b.day)
}

func (b birthday) monthUniqueIn(bds []birthday) bool {
    count := 0
    for _, bd := range bds {
        if bd.month == b.month {
            count++
        }
    }
    if count == 1 {
        return true
    }
    return false
}

func (b birthday) dayUniqueIn(bds []birthday) bool {
    count := 0
    for _, bd := range bds {
        if bd.day == b.day {
            count++
        }
    }
    if count == 1 {
        return true
    }
    return false
}

func (b birthday) monthWithUniqueDayIn(bds []birthday) bool {
    for _, bd := range bds {
        if bd.month == b.month && bd.dayUniqueIn(bds) {
            return true
        }
    }
    return false
}

func main() {
    choices := []birthday{
        {5, 15}, {5, 16}, {5, 19}, {6, 17}, {6, 18},
        {7, 14}, {7, 16}, {8, 14}, {8, 15}, {8, 17},
    }

    
    
    var filtered []birthday
    for _, bd := range choices {
        if !bd.monthUniqueIn(choices) {
            filtered = append(filtered, bd)
        }
    }

    
    
    var filtered2 []birthday
    for _, bd := range filtered {
        if !bd.monthWithUniqueDayIn(filtered) {
            filtered2 = append(filtered2, bd)
        }
    }

    
    
    var filtered3 []birthday
    for _, bd := range filtered2 {
        if bd.dayUniqueIn(filtered2) {
            filtered3 = append(filtered3, bd)
        }
    }

    
    
    var filtered4 []birthday
    for _, bd := range filtered3 {
        if bd.monthUniqueIn(filtered3) {
            filtered4 = append(filtered4, bd)
        }
    }

    if len(filtered4) == 1 {
        fmt.Println("Cheryl's birthday is", filtered4[0])
    } else {
        fmt.Println("Something went wrong!")
    }
}

VB: Private Sub exclude_unique_days(w As Collection)
    Dim number_of_dates(31) As Integer
    Dim months_to_exclude As New Collection
    For Each v In w
        number_of_dates(v(1)) = number_of_dates(v(1)) + 1
    Next v
    For i = w.Count To 1 Step -1
        If number_of_dates(w(i)(1)) = 1 Then
            months_to_exclude.Add w(i)(0)
            w.Remove i
        End If
    Next i
    For Each m In months_to_exclude
        exclude_month w, m
    Next m
End Sub
Private Sub exclude_month(x As Collection, v As Variant)
    For i = x.Count To 1 Step -1
        If x(i)(0) = v Then x.Remove i
    Next i
End Sub
Private Sub exclude_non_unique_days(w As Collection)
    Dim number_of_dates(31) As Integer
    For Each v In w
        number_of_dates(v(1)) = number_of_dates(v(1)) + 1
    Next v
    For i = w.Count To 1 Step -1
        If number_of_dates(w(i)(1)) > 1 Then
            w.Remove i
        End If
    Next i
End Sub
Private Sub exclude_non_unique_months(w As Collection)
    Dim months As New Collection
    For Each v In w
        On Error GoTo 1
        months.Add v(0), v(0)
    Next v
1:
    For i = w.Count To 1 Step -1
        If w(i)(0) = v(0) Then
            w.Remove i
        End If
    Next i
End Sub
Public Sub cherylsbirthday()
    Dim v As New Collection
    s = "May 15, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15, August 17"
    t = Split(s, ",")
    For Each u In t
        v.Add Split(Trim(u), " ")
    Next u
    
    exclude_unique_days v
    
    exclude_non_unique_days v
    
    exclude_non_unique_months v
    Debug.Print v(1)(0); " "; v(1)(1)
End Sub