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Negative Double (X)

W
N
E
S
1
1
P
2
P
2
X
?

What mean X for East ? negative or penalties ?

What meaning negative double and positive double ?

Iexpecttherewhowant to helpmeandsend it tomy email"dyahyulianto@yahoo.co.id,the literature on"negative double" and"positive double " thank you.

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