<hppavilion[1]> le/rn last-class function/A last-class function is a function that cannot be passed as an argument, accept a function as an argument, be returned by a function, return a function, set to a variable other than its initial name, or be called

'Collatz problem calculator
'Programmed by Jannis Harder (jix), 2005
1[1?,1~10:2,0>-1,2=*0,2>-2,0+*2,0+*1,0-48]1
2[0#,5=10,5$,0~1:0,1=*0,1|1,1<-1:3,0>1]2
3[1=*0,0+*1,0+*1,0+1]2