diff --git a/day19/d19p1.swift b/day19/d19p1.swift
index 91f794e..1d1d238 100644
--- a/day19/d19p1.swift
+++ b/day19/d19p1.swift
@@ -1,27 +1,17 @@
 import Foundation
 
-enum Color: Character, CustomStringConvertible {
-    case r = "r"
-    case g = "g"
-    case u = "u"
-    case w = "w"
-    case b = "b"
-    var description: String { return String(self.rawValue) }
-}
+typealias Color = Character
 
 func readInput(_ filePath: String) throws -> ([[Color]], [[Color]]) {
     let content = try String(contentsOfFile: filePath, encoding: .ascii)
     let lines = content.split(separator: "\n")
-    let towels = lines[0].split(separator: ", ").map { $0.compactMap(Color.init) }
-    let patterns = lines[1..<lines.count].map { $0.compactMap(Color.init) }
+    let towels = lines[0].split(separator: ", ").map(Array.init)
+    let patterns = lines[1..<lines.count].map(Array.init)
     return (towels, patterns)
 }
 
-var cache: [[Color]: Bool] = [:]
+var cache: [[Color]: Bool] = [[]: true]
 func canMatch(_ pattern: [Color], _ towels: [[Color]]) -> Bool {
-    if pattern.count == 0 {
-        return true
-    }
     if let cached = cache[pattern] {
         return cached
     }