Just simple.
I make a new word, and you make a word based on the last letter of my word. For example :
My word :
smar
tand then, a second member make his/her word based on the last letter of my word, which is 't' :
thum
band then, a third member make his/her word, based on the last letter of second member's word, which is 'b' :
beam
and so on.
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Well, let's begin!

super