12 21: 6 solutions

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Solution 1

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx

Solution 2

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx

Solution 3

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx

Solution 4

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx

Solution 5

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx

Solution 6

Jan	Feb	Mar	Apr	May	Jun	xxx
Jul	Aug	Sep	Oct	Nov	Dec	xxx
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31	xxx	xxx	xxx	xxx