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+#!/usr/bin/env raku
+# :vim ft=raku sw=4 expandtab  # 🦋 ∅∪∩∋∈∉⊆ ≡ ≢ «␤ » ∴
+use v6.d;
+use Test;
+
+=begin comment
+Task 1: Broken Keys
+Submitted by: Mohammad Sajid Anwar
+You are given a sentence, $sentence and list of broken keys @keys.
+
+Write a script to find out how many words can be typed fully.
+
+Example 1
+Input: $sentence = "Perl Weekly Challenge", @keys = ('l', 'a')
+Output: 0
+Example 2
+Input: $sentence = "Perl and Raku", @keys = ('a')
+Output: 1
+
+Only Perl since the other word two words contain 'a' and can't be typed fully.
+Example 3
+Input: $sentence = "Well done Team PWC", @keys = ('l', 'o')
+Output: 2
+Example 4
+Input: $sentence = "The joys of polyglottism", @keys = ('T')
+Output: 2
+=end comment
+
+my @Test =
+    #   words                   disease         healthy count
+    "Perl and Raku",            ('a',),         1,
+    "Perl Weekly Challenge",    ('l', 'a'),     0,
+    "Well done Team PWC",       ('l', 'o'),     2,
+    "The joys of polyglottism", ('T',),         2,
+    "The horrors of babel",     (),             4,
+
+;
+plan @Test ÷ 3;
+
+only task( $sentence is copy, @poison --> Int) {
+    + $sentence.words».contains( /:ignorecase @poison /).grep( !*);
+}
+
+for @Test -> $in, @poison, $exp {
+    is task($in, @poison), $exp, "$exp <- $in [ @poison[]]";
+}
+
+done-testing;
+
+my $sentence = "Perl and Raku";
+my @key = ('p',);
+
+say qq{\nInput: \$sentence = "Perl and Raku", @keys = @key[]\n}
+    ~ "Output: ", task $sentence, @key;