⍝ Char matrix from tree:

    tfmt'tea'
tea

    tfmt'hot' 'tea' 'coffee'
hot       
·   tea   
·   coffee

    tfmt'drink'('hot' 'tea' 'coffee')('cold' 'milk' 'beer')
drink         
·   hot       
·   ·   tea   
·   ·   coffee
·   cold      
·   ·   milk  
·   ·   beer  

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