Dynamic select between multiple 'Cascading Dynamic Choice Parameter'

[githublurker]

Is it possible for one Cascading Dynamic Choice Parameter to output values based on values in another Cascading Dynamic Choice Parameter ?

For example:
Cascading Dynamic Choice Parameter #1 values: a,b,c,d
Cascading Dynamic Choice Parameter #2 values: Get values from #1, if a=>g,if b=>g, c=>x, etc

In other words:
Is Cascading Dynamic Choice Parameter able to extract values from another Cascading Dynamic Choice Parameter ? or only from simple 'Choice' parameter. ?

This might be a Groovy question. How can write a Groovy script in one Cascading Dynamic Choice Parameter that will get the values from another Cascading Dynamic Choice Parameter (that also has Groovy script and outputs a list).