user: Question: What is Choreographer(s), when Chosen By is Mary Murphy, and when Couple is Katee Shean Stephen "Twitch" Boss?
Columns: ['Couple', 'Style', 'Music', 'Choreographer(s)', 'Chosen by']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Katee Shean Joshua Allen', 'Bollywood', '"Dhoom Taana" from Om Shanti Om', 'Nakul Dev Mahajan', 'Nigel Lythgoe']
SQL:

assistant: SELECT "Choreographer(s)" FROM "Table" WHERE "Chosen by" = 'Mary Murphy' AND "Couple" = 'Katee Shean Stephen "Twitch" Boss';