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+########################################################
+#
+# Synonym
+#
+# From Basic Computer Games (1978)
+#
+# A synonym of a word is another word (in the English language) which has the same,
+# or very nearly the same, meaning. This program tests your knowledge of synonyms
+# of a few common words.
+#
+# The computer chooses a word and asks you for a synonym. The computer then tells
+# you whether you’re right or wrong. If you can’t think of a synonym, type “HELP”
+# which causes a synonym to be printed.
+# You may put in words of your choice in the data statements.
+# The number following DATA in Statement 500 is the total number of data statements.
+# In each data statement, the first number is the number of words in that statement.
+#
+# Can you think of a way to make this into a more general kind of CAI program for any subject?
+# Walt Koetke of Lexington High School, Massachusetts created this program.
+#
+#
+########################################################
+
+puts <<~INSTRUCTIONS
+                                 SYNONYM
+                 CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY
+
+A SYNONYM OF A WORD MEANS ANOTHER WORD IN THE ENGLISH
+LANGUAGE WHICH HAS THE SAME OR VERY NEARLY THE SAME MEANING.
+I CHOOSE A WORD -- YOU TYPE A SYNONYM.
+IF YOU CAN'T THINK OF A SYNONYM, TYPE THE WORD 'HELP'
+AND I WILL TELL YOU A SYNONYM.
+
+
+INSTRUCTIONS
+
+right_words = ["RIGHT", "CORRECT", "FINE", "GOOD!", "CHECK"]
+
+synonym_words = [
+    ["FIRST", "START", "BEGINNING", "ONSET", "INITIAL"],
+    ["SIMILAR", "ALIKE", "SAME", "LIKE", "RESEMBLING"],
+    ["MODEL", "PATTERN", "PROTOTYPE", "STANDARD", "CRITERION"],
+    ["SMALL", "INSIGNIFICANT", "LITTLE", "TINY", "MINUTE"],
+    ["STOP", "HALT", "STAY", "ARREST", "CHECK", "STANDSTILL"],
+    ["HOUSE", "DWELLING", "RESIDENCE", "DOMICILE", "LODGING", "HABITATION"],
+    ["PIT", "HOLE", "HOLLOW", "WELL", "GULF", "CHASM", "ABYSS"],
+    ["PUSH", "SHOVE", "THRUST", "PROD", "POKE", "BUTT", "PRESS"],
+    ["RED", "ROUGE", "SCARLET", "CRIMSON", "FLAME", "RUBY"],
+    ["PAIN", "SUFFERING", "HURT", "MISERY", "DISTRESS", "ACHE", "DISCOMFORT"],
+]
+
+synonym_words.shuffle.each {|words_ar| 
+
+}
+
+
+synonym_words.each {|words_ar| 
+    answer = false 
+    keyword = words_ar.shift
+
+    while not answer and words_ar.length != 0
+        puts "     WHAT IS A SYNONYM OF #{keyword}? "
+        inp = gets.chomp.upcase
+
+        if inp  == "HELP"
+            clue = words_ar.sample
+            puts "**** A SYNONYM OF #{keyword} IS #{clue}."
+            words_ar.delete(clue)
+        elsif words_ar.include? inp
+            puts right_words.sample
+            answer = true
+        else
+            puts "TRY AGAIN."
+        end
+
+    end
+
+}
+
+puts "SYNONYM DRILL COMPLETED"
+
+
+######################################################################
+#
+# Porting notes
+#
+#  There is a bug in the original program where if you keep asking for
+# synoyms of a given word it ends up running out of synonyms
+# in the array and the program crashes.
+#  The bug has been fixed in this version and now when
+# it runs out of words it continues with the next
+# array.
+#
+######################################################################