feat(work): add blind deduction set comments and problem1 function stub

work/Blind/deduction.js

@@ -1,3 +1,4 @@
+
 // ============================================================
 // BLIND DEDUCTION SET — Monday evening, ONE round, then stop.
 // The 6 core interview problems, disguised exactly as they'd
@@ -16,7 +17,6 @@
 // problem1([5])               => [0]
 // problem1([4, 1, 4, 1])      => [2, 0, 2, 0]
 function problem1(arr) {
-  // your code
 }
 
 // ---- problem2 ----