SimilarityRank
optional 0.860 6363
be_optional 0.690 16185
(_optional_) 0.648 27676
Optional 0.627 93304
optionally 0.612 18069
may_include_a 0.571 52263
mandatory 0.565 7238
an_additional 0.561 7318
a_built-in 0.547 82345
if_desire 0.545 20726
an_extended 0.544 23071
built-in 0.531 13021
a_separate 0.527 6651
include_one_or_more 0.525 65697
with_an_additional 0.523 63075
as_an_option 0.520 37945
selectable 0.512 83576
with_integrated 0.511 65705
an_added 0.511 97201
an_option 0.511 12110
an_extra 0.508 15322
may_also_include 0.502 72083
an_external 0.501 22375
as_an_additional 0.501 64268
an_embed 0.499 96381