' Constructs 10 x 10 Composed Magic Squares (Type 2):
' - Read Symmetrical Magic Square (6 x 6)
' - Generate Pan Magic Squares (4 x 4) and Supplementairy Pairs

' Tested with Office 2007 under Windows 7

Sub Priem10c4()

Dim a1(100), a(100), b1(100), b(100), c(100)
Dim a4(16), b4(16), c4(16), d6(36)               'Sub Squares

y = MsgBox("Locked", vbCritical, "Routine Priem10c4")
End

n2 = 0: n3 = 0: k1 = 1: k2 = 1: n9 = 0
Sht1 = "Pairs8"

'   Generate Squares

t1 = Timer

For j100 = 102 To 201

'   Start Reading Data

MC6 = Sheets("Lines6").Cells(j100, 37).Value
MC10 = 5 * MC6 / 3

'   Read Integers used for Corner Square (6 x 6)

For i1 = 1 To 36
a(i1) = Sheets("Lines6").Cells(j100, i1).Value
Next i1

GoSub 2010              'Define Integers
n8 = 36: GoSub 950      'Remove used Integers from available Integers

For i1 = 1 To 36: d6(i1) = a(i1): Next i1

GoSub 600               'Compose Main Square

t11 = Timer                                                 'Time Out

For j84 = m1 To m2                                          'a(84)
If b1(a1(j84)) = 0 Then GoTo 840
If b(a1(j84)) = 0 Then b(a1(j84)) = a1(j84): c(84) = a1(j84) Else GoTo 840
a(84) = a1(j84)

a(62) = 0.5 * s1 - a(84)
If a(62) < a1(m1) Or a(62) > a1(m2) Then GoTo 620:
If b1(a(62)) = 0 Then GoTo 620
If b(a(62)) = 0 Then b(a(62)) = a(62): c(62) = a(62) Else GoTo 620

For j83 = m1 To m2                                          'a(83)
If b1(a1(j83)) = 0 Then GoTo 830
If b(a1(j83)) = 0 Then b(a1(j83)) = a1(j83): c(83) = a1(j83) Else GoTo 830
a(83) = a1(j83)

a(61) = 0.5 * s1 - a(83)
If a(61) < a1(m1) Or a(61) > a1(m2) Then GoTo 610:
If b1(a(61)) = 0 Then GoTo 610
If b(a(61)) = 0 Then b(a(61)) = a(61): c(61) = a(61) Else GoTo 610

For j82 = m1 To m2                                          'a(82)
If b1(a1(j82)) = 0 Then GoTo 820
If b(a1(j82)) = 0 Then b(a1(j82)) = a1(j82): c(82) = a1(j82) Else GoTo 820
a(82) = a1(j82)

a(81) = s1 - a(82) - a(83) - a(84)
If a(81) < a1(m1) Or a(81) > a1(m2) Then GoTo 810
If b1(a(81)) = 0 Then GoTo 810
If b(a(81)) = 0 Then b(a(81)) = a(81): c(81) = a(81) Else GoTo 810

a(64) = 0.5 * s1 - a(82)
If a(64) < a1(m1) Or a(64) > a1(m2) Then GoTo 640
If b1(a(64)) = 0 Then GoTo 640
If b(a(64)) = 0 Then b(a(64)) = a(64): c(64) = a(64) Else GoTo 640

a(63) = -0.5 * s1 + a(82) + a(83) + a(84)
If a(63) < a1(m1) Or a(63) > a1(m2) Then GoTo 630:
If b1(a(63)) = 0 Then GoTo 630
If b(a(63)) = 0 Then b(a(63)) = a(63): c(63) = a(63) Else GoTo 630

For j74 = m1 To m2                                          'a(74)
If b1(a1(j74)) = 0 Then GoTo 740
If b(a1(j74)) = 0 Then b(a1(j74)) = a1(j74): c(74) = a1(j74) Else GoTo 740
a(74) = a1(j74)

a(73) = s1 - a(74) - a(83) - a(84)
If a(73) < a1(m1) Or a(73) > a1(m2) Then GoTo 730
If b1(a(73)) = 0 Then GoTo 730
If b(a(73)) = 0 Then b(a(73)) = a(73): c(73) = a(73) Else GoTo 730

a(72) = a(74) - a(82) + a(84)
If a(72) < a1(m1) Or a(72) > a1(m2) Then GoTo 720
If b1(a(72)) = 0 Then GoTo 720
If b(a(72)) = 0 Then b(a(72)) = a(72): c(72) = a(72) Else GoTo 720

a(71) = -a(74) + a(82) + a(83)
If a(71) < a1(m1) Or a(71) > a1(m2) Then GoTo 710
If b1(a(71)) = 0 Then GoTo 710
If b(a(71)) = 0 Then b(a(71)) = a(71): c(71) = a(71) Else GoTo 710

a(54) = 0.5 * s1 - a(74) + a(82) - a(84)
If a(54) < a1(m1) Or a(54) > a1(m2) Then GoTo 540:
If b1(a(54)) = 0 Then GoTo 540
If b(a(54)) = 0 Then b(a(54)) = a(54): c(54) = a(54) Else GoTo 540

a(53) = 0.5 * s1 + a(74) - a(82) - a(83)
If a(53) < a1(m1) Or a(53) > a1(m2) Then GoTo 530:
If b1(a(53)) = 0 Then GoTo 530
If b(a(53)) = 0 Then b(a(53)) = a(53): c(53) = a(53) Else GoTo 530

a(52) = 0.5 * s1 - a(74)
If a(52) < a1(m1) Or a(52) > a1(m2) Then GoTo 520:
If b1(a(52)) = 0 Then GoTo 520
If b(a(52)) = 0 Then b(a(52)) = a(52): c(52) = a(52) Else GoTo 520

a(51) = -0.5 * s1 + a(74) + a(83) + a(84)
If a(51) < a1(m1) Or a(51) > a1(m2) Then GoTo 510:
If b1(a(51)) = 0 Then GoTo 510
If b(a(51)) = 0 Then b(a(51)) = a(51): c(51) = a(51) Else GoTo 510

'   Complete Diagonal

For j91 = m1 To m2                                          'a(91)
If b1(a1(j91)) = 0 Then GoTo 910
If b(a1(j91)) = 0 Then b(a1(j91)) = a1(j91): c(91) = a1(j91) Else GoTo 910
a(91) = a1(j91)

a(41) = 0.5 * s1 - a(91): If b(a(41)) = 0 Then b(a(41)) = a(41): c(41) = a(41) Else GoTo 410

For j37 = m1 To m2                                          'a(37)
If b1(a1(j37)) = 0 Then GoTo 370
If b(a1(j37)) = 0 Then b(a1(j37)) = a1(j37): c(37) = a1(j37) Else GoTo 370
a(37) = a1(j37)

a(19) = 0.5 * s1 - a(37): If b(a(19)) = 0 Then b(a(19)) = a(19): c(19) = a(19) Else GoTo 190

For j28 = m1 To m2                                          'a(28)
If b1(a1(j28)) = 0 Then GoTo 280
If b(a1(j28)) = 0 Then b(a1(j28)) = a1(j28): c(28) = a1(j28) Else GoTo 280
a(28) = a1(j28)

a(6) = 0.5 * s1 - a(28): If b(a(6)) = 0 Then b(a(6)) = a(6): c(6) = a(6) Else GoTo 60

a(10) = s10 - a(91) - a(82) - a(73) - a(64) - a(55) - a(46) - a(37) - a(28) - a(19)
If a(10) < a1(m1) Or a(10) > a1(m2) Then GoTo 100:
If b1(a(10)) = 0 Then GoTo 100
If b(a(10)) = 0 Then b(a(10)) = a(10): c(10) = a(10) Else GoTo 100

a(5) = 0.5 * s1 - a(10): If b(a(5)) = 0 Then b(a(5)) = a(5): c(5) = a(5) Else GoTo 50

For j39 = m1 To m2                                          'a(39)
If b1(a1(j39)) = 0 Then GoTo 390
If b(a1(j39)) = 0 Then b(a1(j39)) = a1(j39): c(39) = a1(j39) Else GoTo 390
a(39) = a1(j39)

a(17) = 0.5 * s1 - a(39)
If a(17) < a1(m1) Or a(17) > a1(m2) Then GoTo 170:
If b1(a(17)) = 0 Then GoTo 170
If b(a(17)) = 0 Then b(a(17)) = a(17): c(17) = a(17) Else GoTo 170

For j38 = m1 To m2                                          'a(38)
If b1(a1(j38)) = 0 Then GoTo 380
If b(a1(j38)) = 0 Then b(a1(j38)) = a1(j38): c(38) = a1(j38) Else GoTo 380
a(38) = a1(j38)

a(16) = 0.5 * s1 - a(38)
If a(16) < a1(m1) Or a(16) > a1(m2) Then GoTo 160:
If b1(a(16)) = 0 Then GoTo 160
If b(a(16)) = 0 Then b(a(16)) = a(16): c(16) = a(16) Else GoTo 160

a(36) = s1 - a(37) - a(38) - a(39)
If a(36) < a1(m1) Or a(36) > a1(m2) Then GoTo 360
If b1(a(36)) = 0 Then GoTo 360
If b(a(36)) = 0 Then b(a(36)) = a(36): c(36) = a(36) Else GoTo 360

a(18) = -0.5 * s1 + a(37) + a(38) + a(39)
If a(18) < a1(m1) Or a(18) > a1(m2) Then GoTo 180:
If b1(a(18)) = 0 Then GoTo 180
If b(a(18)) = 0 Then b(a(18)) = a(18): c(18) = a(18) Else GoTo 180

a(29) = s1 - a(38) - a(39) - a(28)
If a(29) < a1(m1) Or a(29) > a1(m2) Then GoTo 290
If b1(a(29)) = 0 Then GoTo 290
If b(a(29)) = 0 Then b(a(29)) = a(29): c(29) = a(29) Else GoTo 290

a(7) = 0.5 * s1 - a(29): If b(a(7)) = 0 Then b(a(7)) = a(7): c(7) = a(7) Else GoTo 70

a(27) = s1 - a(38) - a(28) - a(37)
If a(27) < a1(m1) Or a(27) > a1(m2) Then GoTo 270
If b1(a(27)) = 0 Then GoTo 270
If b(a(27)) = 0 Then b(a(27)) = a(27): c(27) = a(27) Else GoTo 270

a(9) = 0.5 * s1 - a(27): If b(a(9)) = 0 Then b(a(9)) = a(9): c(9) = a(9) Else GoTo 90

a(26) = -a(29) + a(37) + a(38)
If a(26) < a1(m1) Or a(26) > a1(m2) Then GoTo 260
If b1(a(26)) = 0 Then GoTo 260
If b(a(26)) = 0 Then b(a(26)) = a(26): c(26) = a(26) Else GoTo 260

a(8) = 0.5 * s1 - a(26): If b(a(8)) = 0 Then b(a(8)) = a(8): c(8) = a(8) Else GoTo 80

For j34 = m1 To m2                                          'a(34)
If b1(a1(j34)) = 0 Then GoTo 340
If b(a1(j34)) = 0 Then b(a1(j34)) = a1(j34): c(34) = a1(j34) Else GoTo 340
a(34) = a1(j34)

a(12) = 0.5 * s1 - a(34)
If a(12) < a1(m1) Or a(12) > a1(m2) Then GoTo 120:
If b1(a(12)) = 0 Then GoTo 120
If b(a(12)) = 0 Then b(a(12)) = a(12): c(12) = a(12) Else GoTo 120

t12 = Timer: t13 = t12 - t11                                'Time Out
If t13 > 10 Then Erase b, c: GoTo 1000                      'Time Out, Try Next

For j33 = m1 To m2                                          'a(33)
If b1(a1(j33)) = 0 Then GoTo 330
If b(a1(j33)) = 0 Then b(a1(j33)) = a1(j33): c(33) = a1(j33) Else GoTo 330
a(33) = a1(j33)

a(11) = 0.5 * s1 - a(33)
If a(11) < a1(m1) Or a(11) > a1(m2) Then GoTo 110:
If b1(a(11)) = 0 Then GoTo 110
If b(a(11)) = 0 Then b(a(11)) = a(11): c(11) = a(11) Else GoTo 110

For j32 = m1 To m2                                          'a(32)
If b1(a1(j32)) = 0 Then GoTo 320
If b(a1(j32)) = 0 Then b(a1(j32)) = a1(j32): c(32) = a1(j32) Else GoTo 320
a(32) = a1(j32)

a(31) = s1 - a(32) - a(33) - a(34)
If a(31) < a1(m1) Or a(31) > a1(m2) Then GoTo 310
If b1(a(31)) = 0 Then GoTo 310
If b(a(31)) = 0 Then b(a(31)) = a(31): c(31) = a(31) Else GoTo 310

a(14) = 0.5 * s1 - a(32)
If a(14) < a1(m1) Or a(14) > a1(m2) Then GoTo 140
If b1(a(14)) = 0 Then GoTo 140
If b(a(14)) = 0 Then b(a(14)) = a(14): c(14) = a(14) Else GoTo 140

a(13) = -0.5 * s1 + a(32) + a(33) + a(34)
If a(13) < a1(m1) Or a(13) > a1(m2) Then GoTo 130:
If b1(a(13)) = 0 Then GoTo 130
If b(a(13)) = 0 Then b(a(13)) = a(13): c(13) = a(13) Else GoTo 130

For j24 = m1 To m2                                          'a(24)
If b1(a1(j24)) = 0 Then GoTo 240
If b(a1(j24)) = 0 Then b(a1(j24)) = a1(j24): c(24) = a1(j24) Else GoTo 240
a(24) = a1(j24)

a(23) = s1 - a(24) - a(33) - a(34)
If a(23) < a1(m1) Or a(23) > a1(m2) Then GoTo 230
If b1(a(23)) = 0 Then GoTo 230
If b(a(23)) = 0 Then b(a(23)) = a(23): c(23) = a(23) Else GoTo 230

a(22) = a(24) - a(32) + a(34)
If a(22) < a1(m1) Or a(22) > a1(m2) Then GoTo 220
If b1(a(22)) = 0 Then GoTo 220
If b(a(22)) = 0 Then b(a(22)) = a(22): c(22) = a(22) Else GoTo 220

a(21) = -a(24) + a(32) + a(33)
If a(21) < a1(m1) Or a(21) > a1(m2) Then GoTo 210
If b1(a(21)) = 0 Then GoTo 210
If b(a(21)) = 0 Then b(a(21)) = a(21): c(21) = a(21) Else GoTo 210

a(4) = 0.5 * s1 - a(24) + a(32) - a(34)
If a(4) < a1(m1) Or a(4) > a1(m2) Then GoTo 40:
If b1(a(4)) = 0 Then GoTo 40
If b(a(4)) = 0 Then b(a(4)) = a(4): c(4) = a(4) Else GoTo 40

a(3) = 0.5 * s1 + a(24) - a(32) - a(33)
If a(3) < a1(m1) Or a(3) > a1(m2) Then GoTo 30:
If b1(a(3)) = 0 Then GoTo 30
If b(a(3)) = 0 Then b(a(3)) = a(3): c(3) = a(3) Else GoTo 30

a(2) = 0.5 * s1 - a(24)
If a(2) < a1(m1) Or a(2) > a1(m2) Then GoTo 20:
If b1(a(2)) = 0 Then GoTo 20
If b(a(2)) = 0 Then b(a(2)) = a(2): c(2) = a(2) Else GoTo 20

a(1) = -0.5 * s1 + a(24) + a(33) + a(34)
If a(1) < a1(m1) Or a(1) > a1(m2) Then GoTo 10:
If b1(a(1)) = 0 Then GoTo 10
If b(a(1)) = 0 Then b(a(1)) = a(1): c(1) = a(1) Else GoTo 10

GoSub 1200: If fl2 = 0 Then GoTo 5   'Complete Main Square

n8 = 100: GoSub 1800                 'Double Check Identical Integers
If fl1 = 1 Then
n9 = n9 + 1: GoSub 1650          'Print Composed Square
End If

Erase b, c: n10 = 0: GoTo 1000
5

b(c(1)) = 0: c(1) = 0
10 b(c(2)) = 0: c(2) = 0
20 b(c(3)) = 0: c(3) = 0
30 b(c(4)) = 0: c(4) = 0
40 b(c(21)) = 0: c(21) = 0
210 b(c(22)) = 0: c(22) = 0
220 b(c(23)) = 0: c(23) = 0
230 b(c(24)) = 0: c(24) = 0
240 Next j24

b(c(13)) = 0: c(13) = 0
130 b(c(14)) = 0: c(14) = 0
140 b(c(31)) = 0: c(31) = 0
310 b(c(32)) = 0: c(32) = 0
320 Next j32

b(c(11)) = 0: c(11) = 0
110 b(c(33)) = 0: c(33) = 0
330 Next j33

b(c(12)) = 0: c(12) = 0
120 b(c(34)) = 0: c(34) = 0
340 Next j34

b(c(8)) = 0: c(8) = 0
80  b(c(26)) = 0: c(26) = 0
260 b(c(9)) = 0: c(9) = 0
90  b(c(27)) = 0: c(27) = 0
270 b(c(7)) = 0: c(7) = 0
70  b(c(29)) = 0: c(29) = 0
290 b(c(18)) = 0: c(18) = 0
180 b(c(36)) = 0: c(36) = 0
360 b(c(16)) = 0: c(16) = 0
160 b(c(38)) = 0: c(38) = 0
380 Next j38

b(c(17)) = 0: c(17) = 0
170 b(c(39)) = 0: c(39) = 0
390 Next j39

b(c(5)) = 0: c(5) = 0
50  b(c(10)) = 0: c(10) = 0
100 b(c(6)) = 0: c(6) = 0
60  b(c(28)) = 0: c(28) = 0
280 Next j28

b(c(19)) = 0: c(19) = 0
190 b(c(37)) = 0: c(37) = 0
370 Next j37

b(c(41)) = 0: c(41) = 0
410 b(c(91)) = 0: c(91) = 0
910 Next j91

b(c(51)) = 0: c(51) = 0
510 b(c(52)) = 0: c(52) = 0
520 b(c(53)) = 0: c(53) = 0
530 b(c(54)) = 0: c(54) = 0
540 b(c(71)) = 0: c(71) = 0
710 b(c(72)) = 0: c(72) = 0
720 b(c(73)) = 0: c(73) = 0
730 b(c(74)) = 0: c(74) = 0
740 Next j74

b(c(63)) = 0: c(63) = 0
630 b(c(64)) = 0: c(64) = 0
640 b(c(81)) = 0: c(81) = 0
810 b(c(82)) = 0: c(82) = 0
820 Next j82

b(c(61)) = 0: c(61) = 0
610 b(c(83)) = 0: c(83) = 0
830 Next j83

b(c(62)) = 0: c(62) = 0
620 b(c(84)) = 0: c(84) = 0
840 Next j84

n10 = 0
1000  Next j100

t2 = Timer

t10 = Str(t2 - t1) + " sec., " + Str(n9) + " Solutions for sum" + Str(s10)
y = MsgBox(t10, 0, "Routine Priem10c4")

End

'    Compose Main Square

600  Erase a
'    Symmetric Sub Square 6 x 6

a(45) = d6(1):  a(46) = d6(2):  a(47) = d6(3):  a(48) = d6(4):  a(49) = d6(5):  a(50) = d6(6):
a(55) = d6(7):  a(56) = d6(8):  a(57) = d6(9):  a(58) = d6(10): a(59) = d6(11): a(60) = d6(12):
a(65) = d6(13): a(66) = d6(14): a(67) = d6(15): a(68) = d6(16): a(69) = d6(17): a(70) = d6(18):
a(75) = d6(19): a(76) = d6(20): a(77) = d6(21): a(78) = d6(22): a(79) = d6(23): a(80) = d6(24):
a(85) = d6(25): a(86) = d6(26): a(87) = d6(27): a(88) = d6(28): a(89) = d6(29): a(90) = d6(30):
a(95) = d6(31): a(96) = d6(32): a(97) = d6(33): a(98) = d6(34): a(99) = d6(35): a(100) = d6(36):

Return

'    Exclude solutions with identical numbers a()

1800  fl1 = 1
For j1 = 1 To n8
a2 = a(j1): If a2 = 0 Then GoTo 1810
For j2 = (1 + j1) To n8
If a2 = a(j2) Then fl1 = 0: Return
Next j2
1810  Next j1
Return

'    Remove used Integers from available Integers

950  For j1 = 1 To n8
b1(a(j1)) = 0
Next j1

'    Restore available Integers in a1()

n20 = 0
For j1 = 1 To a20
If b1(j1) <> 0 Then
n20 = n20 + 1
a1(n20) = b1(j1)
End If
Next j1
m1 = 1: m2 = n20
Return

'    Complete Main Square

1200 fl2 = 1

For j92 = m1 To m2                                          'a(92)
If b1(a1(j92)) = 0 Then GoTo 920
If b(a1(j92)) = 0 Then b(a1(j92)) = a1(j92): c(92) = a1(j92) Else GoTo 920
a(92) = a1(j92)

a(42) = s1 / 2 - a(92): If b(a(42)) = 0 Then b(a(42)) = a(42): c(42) = a(42) Else GoTo 420

For j93 = m1 To m2                                          'a(93)
If b1(a1(j93)) = 0 Then GoTo 930
If b(a1(j93)) = 0 Then b(a1(j93)) = a1(j93): c(93) = a1(j93) Else GoTo 930
a(93) = a1(j93)

a(43) = s1 / 2 - a(93): If b(a(43)) = 0 Then b(a(43)) = a(43): c(43) = a(43) Else GoTo 430

a(94) = s1 - a(93) - a(92) - a(91)
If a(94) < a1(m1) Or a(94) > a1(m2) Then GoTo 940:
If b1(a(94)) = 0 Then GoTo 940
If b(a(94)) = 0 Then b(a(94)) = a(94): c(94) = a(94) Else GoTo 940

a(44) = s1 / 2 - a(94): If b(a(44)) = 0 Then b(a(44)) = a(44): c(44) = a(44) Else GoTo 440

For j20 = m1 To m2                                          'a(20)
If b1(a1(j20)) = 0 Then GoTo 200
If b(a1(j20)) = 0 Then b(a1(j20)) = a1(j20): c(20) = a1(j20) Else GoTo 200
a(20) = a1(j20)

a(15) = s1 / 2 - a(20): If b(a(15)) = 0 Then b(a(15)) = a(15): c(15) = a(15) Else GoTo 150

For j30 = m1 To m2                                          'a(30)
If b1(a1(j30)) = 0 Then GoTo 300
If b(a1(j30)) = 0 Then b(a1(j30)) = a1(j30): c(30) = a1(j30) Else GoTo 300
a(30) = a1(j30)

a(25) = s1 / 2 - a(30): If b(a(25)) = 0 Then b(a(25)) = a(25): c(25) = a(25) Else GoTo 250

a(40) = s1 - a(30) - a(20) - a(10)
If a(40) < a1(m1) Or a(40) > a1(m2) Then GoTo 400:
If b1(a(40)) = 0 Then GoTo 400
If b(a(40)) = 0 Then b(a(40)) = a(40): c(40) = a(40) Else GoTo 400

a(35) = s1 / 2 - a(40): If b(a(35)) = 0 Then b(a(35)) = a(35): c(35) = a(35) Else GoTo 350

fl2 = 1: Return

b(c(35)) = 0: c(35) = 0
350 b(c(40)) = 0: c(40) = 0
400 b(c(25)) = 0: c(25) = 0
250 b(c(30)) = 0: c(30) = 0
300 Next j30

b(c(15)) = 0: c(15) = 0
150 b(c(20)) = 0: c(20) = 0
200 Next j20

b(c(44)) = 0: c(44) = 0
440 b(c(94)) = 0: c(94) = 0
940 b(c(43)) = 0: c(43) = 0
430 b(c(93)) = 0: c(93) = 0
930 Next j93

b(c(42)) = 0: c(42) = 0
420 b(c(92)) = 0: c(92) = 0
920 Next j92

fl2 = 0                 'No solution found
Return

'    Print results (lines)

1640 Cells(n9, 100).Select
For i1 = 1 To 100
Cells(n9, i1).Value = a(i1)
Next i1

Return

'    Print results (squares)

1650 n2 = n2 + 1
If n2 = 3 Then
n2 = 1: k1 = k1 + 11: k2 = 1
Else
If n9 > 1 Then k2 = k2 + 11
End If

Cells(k1, k2 + 1).Select
Cells(k1, k2 + 1).Font.Color = -4165632
Cells(k1, k2 + 1).Value = "MC = " + CStr(MC10)

i3 = 0
For i1 = 1 To 10
For i2 = 1 To 10
i3 = i3 + 1
Cells(k1 + i1, k2 + i2).Value = a(i3)
Next i2
Next i1

Return

'    Define Integers

2010 s1 = 202              'PM4
s10 = 505             'PM10
nVar = 100

m1 = 1: m2 = nVar

For i1 = m1 To m2
a1(i1) = i1
Next i1
a20 = 100             'Maximum

Erase b1
For i1 = m1 To m2
b1(a1(i1)) = a1(i1)
Next i1

Return

End Sub