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diff --git a/challenge-277/0rir/raku/ch-1.raku b/challenge-277/0rir/raku/ch-1.raku
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+++ b/challenge-277/0rir/raku/ch-1.raku
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+#!/usr/bin/env raku
+# :vim ft=raku sw=4 expandtab  # 🦋 ∅∪∩∋∈∉⊆ ≡ ≢ «␤ » ∴
+use v6.d;
+use Test;
+
+=begin comment
+277-1: Count Common         Submitted by: Mohammad Sajid Anwar
+You are given two array of strings, @words1 and @words2.  Return the count
+of words that appears in both arrays exactly once.
+
+Example 1
+Input: @words1 = ("Perl", "is", "my", "friend")
+       @words2 = ("Perl", "and", "Raku", "are", "friend")
+Output: 2
+
+The words "Perl" and "friend" appear once in each array.
+Example 2
+Input: @words1 = ("Perl", "and", "Python", "are", "very", "similar")
+       @words2 = ("Python", "is", "top", "in", "guest", "languages")
+Output: 1
+Example 3
+Input: @words1 = ("Perl", "is", "imperative", "Lisp", "is", "functional")
+       @words2 = ("Crystal", "is", "similar", "to", "Ruby")
+Output: 0
+
+=end comment
+
+my @Test =
+  # exe      list / list
+     0, (), (),
+     0, (), < Pi is positive and is long >,
+     1, ('red',), ('Red', 'dog'),
+     2, ("Perl", "is", "my", "friend"),
+        ("Perl", "and", "Raku", "are", "friend"),
+     1, ("Perl", "and", "Python", "are", "very", "similar"),
+        ("Python", "is", "top", "in", "guest", "languages"),
+     0, ("Perl", "is", "imperative", "Lisp", "is", "functional"),
+        ("Crystal", "is", "similar", "to", "Ruby"),
+;
+plan @Test ÷ 3;
+
+sub task( @a, @b --> Int) {
+    (   (@a».fc).BagHash.grep( *.value == 1 )
+            ∩
+        (@b».fc).BagHash.grep( *.value == 1 )
+    ).elems;
+}
+
+for @Test -> $exp, @a, @b, {
+    is task(@a, @b), $exp, "$exp <- @a[] +/+ @b[]";
+}
+
+done-testing;
+
+my @word1 = < I am positive>;
+my @word2 = < Pi is positive>;
+
+say   "\nInput: @words1 = @word1.List.raku()"
+  ~   "\n       @words2 = @word2.List.raku()"
+  ~   "\n Output: ", task(@word1, @word2);
diff --git a/challenge-277/0rir/raku/ch-2.raku b/challenge-277/0rir/raku/ch-2.raku
new file mode 100644
index 0000000000..beed29ebc8
--- /dev/null
+++ b/challenge-277/0rir/raku/ch-2.raku
@@ -0,0 +1,57 @@
+#!/usr/bin/env raku
+# :vim ft=raku sw=4 expandtab  # 🦋 ∅∪∩∋∈∉⊆ ≡ ≢ «␤ » ∴
+use v6.d;
+use Test;
+
+=begin comment
+277-2: Strong Pair          Submitted by: Mohammad Sajid Anwar
+Given an array of integers, @ints.  Return the count of all strong
+pairs in the given array.
+
+A pair of integers x and y is called strong pair if it satisfies:
+    0 < |x - y| < min(x, y).
+
+Example 1
+Input: @ints = (1, 2, 3, 4, 5)
+Ouput: 4
+
+Strong Pairs: (2, 3), (3, 4), (3, 5), (4, 5)
+Example 2
+Input: @ints = (5, 7, 1, 7)
+Ouput: 1
+
+Strong Pairs: (5, 7)
+=end comment
+
+my @Test =
+ # exp  in
+    Int, List,
+    Int, Array,
+    0,  (),
+    0,  (1,),
+    0,  (1,-1),
+    4,  (1, 2, 3, 4, 5),
+    1,  (5, 7, 1, 7),
+    1,  (2, 3),
+    0,  (1, 2),
+    0,  (1, 30,),
+;
+plan @Test ÷ 2;
+
+only task( @in -->Int) {
+    return Int unless @in.defined;
+    my @a = @in.grep( * > 1).unique;
+    return 0 if +@a == (0,1).any;
+    +@a.combinations(2).grep( { 0 < ($_[0] - $_[1]).abs < $_.min});
+}
+
+for @Test -> $exp, @in {
+    is task(@in), $exp, "$exp.gist() <- @in.gist()";
+}
+
+done-testing;
+
+#    0 < |x - y| < min(x, y).
+my @int = ( -9, -7, -5, 0, 0, 1, 1, 2,  5, 7, 8, 8);
+say "\nInput: @ints = @int.raku()\nOuput: &task(@int)";
+