diff --git a/.github/workflows/debug.yaml b/.github/workflows/debug.yaml
index 14bf746..02d6f7b 100644
--- a/.github/workflows/debug.yaml
+++ b/.github/workflows/debug.yaml
@@ -14,7 +14,9 @@ jobs:
     strategy:
       matrix:
         config:
-          - {os: ubuntu-latest,  r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,  r: 'release', http-user-agent: 'release'}
+          - {os: macOS-latest,  r: 'release', http-user-agent: 'release'}
+          - {os: windows-latest,  r: 'release', http-user-agent: 'release'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
@@ -30,5 +32,5 @@ jobs:
           http-user-agent: ${{ matrix.config.http-user-agent }}
           use-public-rspm: true
 
-      - name: Setup tmate session
-        uses: mxschmitt/action-tmate@HEAD
+      - run: |
+        Rscript n.R
diff --git a/n.R b/n.R
new file mode 100644
index 0000000..ba49958
--- /dev/null
+++ b/n.R
@@ -0,0 +1,38 @@
+install.packages('gsDesign2')
+
+ratio <- 1
+
+enroll_rate <- gsDesign2::define_enroll_rate(duration = c(2, 2, 8),
+                                             rate = c(1, 2, 3))
+
+fail_rate <- gsDesign2::define_fail_rate(duration = c(4, Inf), 
+                                         fail_rate = log(2) / 12,
+                                         hr = c(1, .6),
+                                         dropout_rate = .001)
+
+alpha <- 0.025
+beta <- 0.1
+
+upper <- gsDesign2::gs_spending_bound
+upar <- list(sf = gsDesign::sfLDOF, total_spend = alpha)
+test_upper <- rep(TRUE, 2)
+
+lower <- gsDesign2::gs_spending_bound
+lpar <- list(sf = gsDesign::sfLDOF, total_spend = beta)
+test_lower <- c(TRUE, FALSE)
+binding <- FALSE
+
+info_frac = NULL
+analysis_time = c(24, 36)
+
+x <- gsDesign2::gs_design_ahr(enroll_rate = enroll_rate, fail_rate = fail_rate, 
+                              alpha = alpha, beta = beta, ratio = ratio,
+                              info_frac = info_frac, analysis_time = analysis_time, 
+                              upper = upper, upar = upar, test_upper = test_upper,
+                              lower = lower, lpar = lpar, test_lower = test_lower,
+                              binding = binding)
+
+n <- x$analysis$n
+n - round(n)
+as.integer(n)
+length(sample('All', n[2], TRUE))