Step 
*
 of Lemma 
test-diamond-2_wf
∀[x:test-prop()]. test-diamond-2(x) ∈ test-prop() supposing ↑test-diamond?(x)
BY
 
{ MrecSelectorWf testElim }
 
Latex: 
Latex:
\mforall{}[x:test-prop()].  test-diamond-2(x)  \mmember{}  test-prop()  supposing  \muparrow{}test-diamond?(x)
 By 
Latex:
MrecSelectorWf  testElim
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