Avoid repeating letters between five simple programs
CJam, 73 bytes

"Obkkh+'Phukc&amp;"7f^
q~m!
ri){'j3+_3++~},:+
lS-el_&amp;
4{_' *4@-Y*('**+}%_1&gt;W%\+N*


Each line is a full program. Try them online: 1 | 2 | 3 | 4 | 5

Letter map

 bc  f h  k   op    u       18
            m   q            4
        ij       r          17
    e      l      s          7
             n        w y   27


If you want (and each of your programs fits in a line), you can use this CJam program to create a letter map for your own submission.