$righteq examples:
+++-+++t^n+++f^n+e^(t-123.22)
or
t^n+--++-+f^n++e^(t-123.22)++
or
+++++---+t^n+f^n+++e^(t-123.22)-

##</code><code>##

$remaining[0] is "t^n"
$remaining[1] is "f^n"
$remaining[2] is "e^(t-123.22)"