([word=sedroth] | [tag=NNS]? [□=□]) □
([word=sedroth] | [tag=NNS]? [tag=□]) □
([word=sedroth] | [tag=NNS]? [word=□]) □
The routine should return whether the status of the object is changed , i.e ., whether the event dispatcher should invoke this object 's callback or if no callback whether the object is to be returned to the application program by fl_do_forms ( ) or fl_check_forms ( ) . Note that the first plot is done using the high-level function plot ( ) , whereas the second is done using the low-level function points ( ) . The library routines fl_do_forms ( ) and fl_check_forms ( ) read this queue and handle the events . plot ( ) will create a new graph ; points ( ) simply adds data points to a pre-existing graph . Once a callback function is bound and the specified condition is met , fl_do_forms ( ) or fl_check_forms ( ) invokes the callback function instead of returning the object . Factor out code to issue warnings , add flag to call_trapping_problems ( ) to postpone warning issue , and make * run_hook * _ trapping_problems issue their own warnings tailored to the hook , postponed in the case of safe_run_hook_trapping_problems ( ) so that the appropriate message can be issued about resetting to nil only when not ` quit ' . Of course , there might be several s ( ) commands so the output should be a sequence of percentages , one per line , stating the percentage of the windows that are visible . Depending on the applications , it may be possible to partition the computation into smaller tasks that can be performed within an idle callback one after another , thus eliminating the need of using fl_check_forms ( ) . For example , the abs ( ) method returns a new NumberSource each of whose values has the absolute value of the corresponding value in the original NumberSource . Output lines only for the s ( ) commands .