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don't use length for permutation
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@ -37,7 +37,7 @@ struct WreathProductElem{T<:GroupElem, I<:Integer} <: GroupElem
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function WreathProductElem{T, I}(n::DirectProductGroupElem{T}, p::Generic.perm{I},
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check::Bool=true) where {T, I}
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if check
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length(n.elts) == length(p) || throw(DomainError(
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length(n.elts) == length(p.d) || throw(DomainError(
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"Can't form WreathProductElem: lengths differ"))
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end
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return new(n, p)
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