echo -n "word 1: "
read word1
echo -n "word 2: "
read word2
echo -n "word 3: "
read word3

if [ "$word1" = "$word2" -a "$word2" = "$word3" ]  #-a is boolean AND operator
	then
		echo "Match: words 1 2 & 3"
	elif [ "$word1" = "$word2" ]
	then
		echo "Match: word 1 & 2"
	elif [ "$word1" = "$word3" ]
	then
		echo "Match: word 1 & 3"
	elif [ "$word2" = "$word3" ]
	then
		echo "Match: word 2 & 3"
	else
		echo "No match"
fi