Program 1 DUP DUP MUL SUB Program 2 Impossible Program 3 Empty sequence Program 4 DUP MUL Program 5 DUP DUP ADD SUB Program 6 DUP DUP MUL ADD Program 7 DUP DUP MUL DUP MUL MUL Program 8 DUP DUP DIV DUP ADD DIV Program 9 DUP DUP ADD DUP DUP DIV SUB SUB Program 10 DUP DUP MUL ADD DUP DUP DIV DUP ADD DIV Program 11 DUP DUP DIV DUP DUP ADD ADD DUP MUL DIV Program 12 DUP DUP ADD DUP DUP ADD DUP ADD ADD ADD Program 13 Impossible Program 14 Impossible Program 15 Impossible Program 16 Impossible Program 17 Impossible Program 18 Empty sequence Program 19 DUP DUP DUP MUL SUB ADD Program 20 DUP DUP DUP DUP DIV SUB DUP ADD SUB MUL Program 21 DUP DUP ADD SUB Program 22 DUP DUP DIV DUP DUP ADD SUB DIV Program 23 Impossible