回答編集履歴
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訂正
answer
CHANGED
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@@ -1,22 +1,28 @@
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PHPなど不要。そう、シェル芸ならね！
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```bash
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3
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-
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4
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-
a1,
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5
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-
a1,
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6
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-
a1,
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7
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-
a2,
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8
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-
a2,
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9
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-
a2,
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10
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-
a3,
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11
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-
a3,
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12
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-
a3,
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-
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14
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-
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15
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-
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-
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-
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18
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-
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19
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-
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20
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-
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21
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-
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3
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+
echo {0..4}+{0..4}+{0..4}+{0..4}|xargs -n1 -I@ sh -c 'echo $((@)) @'|tr '+' ' '|awk '/^5/&&$0=($2?"a"$2:"")($3?"b"$3:"")($4?"c"$4:"")($5?"d"$5:"")'|sed -E 's/([1234])([bcd])/\1,\2/g'|awk -F, '!$3'|sort
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4
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+
a1,b4
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5
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+
a1,c4
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6
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+
a1,d4
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7
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+
a2,b3
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8
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a2,c3
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9
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a2,d3
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10
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a3,b2
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11
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+
a3,c2
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12
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+
a3,d2
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13
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+
a4,b1
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14
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+
a4,c1
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15
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+
a4,d1
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16
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+
b1,c4
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17
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+
b1,d4
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18
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+
b2,c3
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19
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+
b2,d3
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20
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+
b3,c2
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21
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+
b3,d2
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22
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+
b4,c1
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23
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+
b4,d1
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24
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+
c1,d4
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25
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+
c2,d3
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26
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+
c3,d2
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27
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+
c4,d1
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22
28
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```
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