. 1 E .. 1 I ... _ 2 S T .... ._ _. 3 H A N ..... .._ ._. _.. 4 5 U R D ...... (nonexistent) _... B ._.. L .._. F ..._ V __ M 6 17 morse codes total with length less than or equal to 6 ( .=1, _=3 ) >> 128*log(2)/log(17) = 31.3153 or using the sixteen short existing morse codes "eist han5 urdb lfvm" (a little unfortunate that s and 5 are both there) (and u v) (and i l) log16 = 32