Methods to bind two objects of the same class.
## S4 method for signature 'designfactors,designfactors' bind(x, y)
an object of the first class in the signature.
an object of the second class in the signature.
An object of the same class as
containing their joint content.
Factors with same name are distinguished and advertised with a warning.
Class where this method applies:
1 2 3 4 5
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