loopHelper : (n : @$\mathbb{N}$@) @$\rightarrow$@ (env : Envc ) @$\rightarrow$@ (eq : varn env @$\equiv$@ n) @$\rightarrow$@ (seq : whileTestStateP s2 env)
           @$\rightarrow$@ loopPwP' n env (sym eq) seq (@$\lambda$@ env@$\_{1}$@ x @$\rightarrow$@ (vari env@$\_{1}$@ @$\equiv$@ c10 env@$\_{1}$@))
loopHelper zero env eq refl rewrite eq = refl
loopHelper (suc n) env refl refl =
           loopHelper n (record { c10 = suc (n + vari env) ; varn = n ; vari = suc (vari env) }) refl (+-suc n (vari env))