Question 1112257
2 ways to choose if one E/T
2^2 ways to choose the second. Dot-dot, dot-dash, dash-dot, dash-dash I/A/N/M
2^3 ways to choose the third. .../..-/.-./-../--./-.-/.--/---/
2^4 ways to choose the fourth
This is 2+4+8+16=30 possibilities.