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|  | 10933 = [[Esolang:Introduce yourself]] |  | 10933 = [[Esolang:Introduce yourself]] | 
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|  | Removed requirement to sign because new users keep messing it up. |  | Removed requirement to sign because new users keep messing it up. | 
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|  | To prevent accidentally breaking the system, even old users are prevented from adding http links to the introduction page. |  | To prevent accidentally breaking the system, even old users are prevented from adding http links to the introduction page. | 
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|  | In a (barely failed) attempt to express this without repeating conditions, I made this handy Karnaugh diagram: |  | In a (barely failed) attempt to express this without repeating conditions, I made this handy Karnaugh diagram: | 
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|  | A = article_articleid != 10933 |  | A = article_articleid != 10933 | 
|  | N = !(user_editcount > 0) & action != "createaccount" |  | N = !(user_editcount > 0) & action != "createaccount" | 
|  | C = (!(user_age > 0) | edit_diff contains "\n-" | edit_delta > 3000 |  | C = (!(user_age > 0) | edit_diff contains "\n-" | edit_delta > 3000 | 
|  | D = edit_diff contains "http" |  | D = edit_diff contains "http" | 
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|  |              AN |  |              AN | 
|  |              00  01  11  10 |  |              00  01  11  10 | 
|  | CD  00               X |  | CD  00               X | 
|  |      01       X   X   X |  |      01       X   X   X | 
|  |      11       X   X   X |  |      11       X   X   X | 
|  |      10           X   X |  |      10           X   X | 
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|  | The filter condition is thus N & (A | C) | (!A & D). |  | The filter condition is thus N & (A | C) | (!A & D). | 
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|  |  | Added requirement that the introduction must be at the end. |