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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Differences | Errors | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Matrix Codes / Differences |
Matrix code difference: common term for two the same postage stamps with no matrix code agreement |
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Matrix code alignment difference: common term for two the same postage stamps with no matrix code alignment agreement |
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