diff --git a/centium_categories.md b/centium_categories.md
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--- /dev/null
+++ b/centium_categories.md
@@ -0,0 +1,7 @@
+# Centium - catégories
+
+00 -> 21 (22) atouts
+22 -> 30 (9) piques valet cavalier dame roi
+31 -> 40 (10) piques 1 -> 10
+41 -> 50 (10) cœurs
+51 -> 60 (10) cœurs 1 -> 10
diff --git a/centium_major.md b/centium_major.md
new file mode 100644
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--- /dev/null
+++ b/centium_major.md
@@ -0,0 +1,115 @@
+# Centium - Major system
+
+0 SCEAU
+1 TOIT
+2 NOIX
+3 MAT
+4 ROI
+5 LION
+6 CHAT
+7 QUILLE
+8 FEU
+9 PAS
+
+| n⁰  | mot clé           |
+| --- | ----------------- |
+| 00  | OASIS             |
+| 01  | SONDE             |
+| 02  | ZEN (MAITRE ZEN)  |
+| 03  | SAUMON            |
+| 04  | SŒUR (BONNE SŒUR) |
+| 05  | SEL               |
+| 06  | SOUCHE            |
+| 07  | SKI               |
+| 08  | SOFA              |
+| 09  | ESPION            |
+| 10  | TASSE             |
+| 11  | TÊTE              |
+| 12  | TONNEAU           |
+| 13  | DIAMANT           |
+| 14  | TAUREAU           |
+| 15  | ÉTOILE            |
+| 16  | DONJON            |
+| 17  | TICKET            |
+| 18  | DAUPHIN           |
+| 19  | TAUPE             |
+| 20  | NOISETTE          |
+| 21  | NATTE             |
+| 22  | NAINE             |
+| 23  | NEM               |
+| 24  | HONNEUR           |
+| 25  | NOUILLES          |
+| 26  | NICHE             |
+| 27  | NOUGAT            |
+| 28  | NAVET             |
+| 29  | NAPPE             |
+| 30  | MAISON            |
+| 31  | MOUTON            |
+| 32  | MOINE             |
+| 33  | MOMIE             |
+| 34  | MARIN             |
+| 35  | MOULIN            |
+| 36  | MOUCHE            |
+| 37  | MAKI              |
+| 38  | MAFIEUX           |
+| 39  | MYOPE             |
+| 40  | ROSE              |
+| 41  | RATEAU            |
+| 42  | REINE             |
+| 43  | RAME              |
+| 44  | RER               |
+| 45  | OREILLE           |
+| 46  | RUCHE             |
+| 47  | REQUIN            |
+| 48  | RÊVE              |
+| 49  | ROBOT             |
+| 50  | LASSO             |
+| 51  | LUTIN             |
+| 52  | LUNE              |
+| 53  | LAMA              |
+| 54  | LARD              |
+| 55  | LILA              |
+| 56  | LUGE              |
+| 57  | LAC               |
+| 58  | LAVE              |
+| 59  | LAPIN             |
+| 60  | CHAISE            |
+| 61  | CHÂTEAU           |
+| 62  | CHAINE            |
+| 63  | CHAMEAU           |
+| 64  | CHARIOT           |
+| 65  | CHALET            |
+| 66  | JUGE              |
+| 67  | CHÈQUE            |
+| 68  | CHEF (CUISTOT)    |
+| 69  | CHAPEAU           |
+| 70  | CAISSE            |
+| 71  | COUTEAU           |
+| 72  | CANON             |
+| 73  | CAMION            |
+| 74  | CRAIE             |
+| 75  | CLÉ               |
+| 76  | CAGE              |
+| 77  | CAKE              |
+| 78  | CAFÉ              |
+| 79  | CUBE              |
+| 80  | FUSÉE             |
+| 81  | FÊTE              |
+| 82  | FOUINE            |
+| 83  | FUMÉE             |
+| 84  | FORET             |
+| 85  | FILET             |
+| 86  | VACHE             |
+| 87  | PHOQUE            |
+| 88  | FÈVE              |
+| 89  | VAPOTEUSE         |
+| 90  | POISSON           |
+| 91  | BÂTON             |
+| 92  | BONNET            |
+| 93  | POMME             |
+| 94  | POIRE             |
+| 95  | PELLE             |
+| 96  | PÊCHE             |
+| 97  | BAGUE             |
+| 99  | PAPE              |
+| 98  | PAVE              |
diff --git a/letterPairs.apkg b/letterPairs.apkg
new file mode 100644
index 0000000..2f3ac45
Binary files /dev/null and b/letterPairs.apkg differ
diff --git a/letterPairs.md b/letterPairs.md
index dd9a985..f850e47 100644
--- a/letterPairs.md
+++ b/letterPairs.md
@@ -2758,6 +2758,10 @@ Worm-tongue (wurm)
 
 weaver
 
+## WW
+
+Woody Woodpecker
+
 ## WX
 
 wax