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{SECT 0 {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 96 "syracuse:=proc(u::po
sint)\n  if (u mod 2)=0 then iquo(u,2)\n  else 3*u+1\n  fi\nend:\nsyra
cuse(1):=1:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 133 "stoppingtim
e:=proc(n::posint)\n  local u,counter;\n  u:=n;\n  for counter from 0 \+
while u<>1 do  \n    u:=syracuse(u)\n  od;\n  counter\nend:" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 17 "stoppingtime(10);" }}{PARA 
11 "" 1 "" {XPPMATH 20 "6#\"\"'" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 
1 0 34 "trace(syracuse):\nstoppingtime(10);" }}{PARA 9 "" 1 "" {TEXT 
-1 30 "\{--> enter syracuse, args = 10" }}{PARA 11 "" 1 "" {XPPMATH 
20 "6#\"\"&" }}{PARA 9 "" 1 "" {TEXT -1 44 "<-- exit syracuse (now in \+
stoppingtime) = 5\}" }}{PARA 9 "" 1 "" {TEXT -1 29 "\{--> enter syracu
se, args = 5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"#;" }}{PARA 9 "" 1 "
" {TEXT -1 45 "<-- exit syracuse (now in stoppingtime) = 16\}" }}
{PARA 9 "" 1 "" {TEXT -1 30 "\{--> enter syracuse, args = 16" }}{PARA 
11 "" 1 "" {XPPMATH 20 "6#\"\")" }}{PARA 9 "" 1 "" {TEXT -1 44 "<-- ex
it syracuse (now in stoppingtime) = 8\}" }}{PARA 9 "" 1 "" {TEXT -1 
29 "\{--> enter syracuse, args = 8" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#
\"\"%" }}{PARA 9 "" 1 "" {TEXT -1 44 "<-- exit syracuse (now in stoppi
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gs = 4" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"#" }}{PARA 9 "" 1 "" 
{TEXT -1 44 "<-- exit syracuse (now in stoppingtime) = 2\}" }}{PARA 9 
"" 1 "" {TEXT -1 29 "\{--> enter syracuse, args = 2" }}{PARA 11 "" 1 "
" {XPPMATH 20 "6#\"\"\"" }}{PARA 9 "" 1 "" {TEXT -1 44 "<-- exit syrac
use (now in stoppingtime) = 1\}" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"
\"'" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "untrace(syracuse):\n
" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 147 "setstoppingtime:=proc(
N::set(posint))\n  local U,counter;\n  U:=N;\n  for counter from 0 whi
le U<>\{1\} do  \n    U:=map(syracuse,U)\n  od;\n  counter\nend:" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "setstoppingtime(\{10\});" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"'" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 28 "setstoppingtime(\{10,11,12\});" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "6#\"#9" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 34 "seq(
stoppingtime(i),i=[10,11,12]);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6%\"\"
'\"#9\"\"*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 52 "trace(setstop
pingtime):\nsetstoppingtime(\{10,11,12\});" }}{PARA 9 "" 1 "" {TEXT 
-1 47 "\{--> enter setstoppingtime, args = \{10, 11, 12\}" }}{PARA 11 
"" 1 "" {XPPMATH 20 "6#>%\"UG<%\"#5\"#6\"#7" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "6#>%\"UG<%\"\"&\"\"'\"#M" }}{PARA 11 "" 1 "" {XPPMATH 20 
"6#>%\"UG<%\"\"$\"#;\"#<" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<%\"
\")\"#5\"#_" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<%\"\"%\"\"&\"#E
" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<%\"\"#\"#8\"#;" }}{PARA 11 
"" 1 "" {XPPMATH 20 "6#>%\"UG<%\"\"\"\"\")\"#S" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "6#>%\"UG<%\"\"\"\"\"%\"#?" }}{PARA 11 "" 1 "" {XPPMATH 
20 "6#>%\"UG<%\"\"\"\"\"#\"#5" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"U
G<$\"\"\"\"\"&" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<$\"\"\"\"#;" 
}}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<$\"\"\"\"\")" }}{PARA 11 "" 
1 "" {XPPMATH 20 "6#>%\"UG<$\"\"\"\"\"%" }}{PARA 11 "" 1 "" {XPPMATH 
20 "6#>%\"UG<$\"\"\"\"\"#" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"UG<#
\"\"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"#9" }}{PARA 9 "" 1 "" 
{TEXT -1 49 "<-- exit setstoppingtime (now at top level) = 14\}" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#\"#9" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 25 "untrace(setstoppingtime):" }}}{EXCHG {PARA 0 "> " 0 "
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