diff --git a/Manticore/Mantis.pm b/Manticore/Mantis.pm
index 3bc75a9..dfbb3eb 100644
--- a/Manticore/Mantis.pm
+++ b/Manticore/Mantis.pm
@@ -141,23 +141,25 @@ sub fontLoader {
       next unless $fn=~m#(.*)\.mant$#;
       my $gly = $1;
       my $fullfile = "$dir/$fn";
-      my $fh = undef;
-      open($fh, '<', $fullfile) or die "Could not read file '$fullfile', because: $!";
-      my @blocks = ([]);
-      while(my $line = <$fh>) {
-        if($line=~m#^===#) {
-          push @blocks, []
-        } else {
-          push @{$blocks[-1]}, $line
-        }
-      }
-      my ($head) = @{shift @blocks};
-      if($head=~m#^(\S+)#) {
-        die "Head glyphem identifier does not equal file name in '$fullfile' ('$1' vs. '$gly')" unless $1 eq $gly
-      } else {
-        die "Malformed head in file $fullfile"
-      }
-      $font{$gly}{data} = [map {rowText2data(join '', @$_)} @blocks]
+      #my $fh = undef;
+      #open($fh, '<', $fullfile) or die "Could not read file '$fullfile', because: $!";
+      #my @blocks = ([]);
+      #while(my $line = <$fh>) {
+      #  if($line=~m#^===#) {
+      #    push @blocks, []
+      #  } else {
+      #    push @{$blocks[-1]}, $line
+      #  }
+      #}
+      #my ($head) = @{shift @blocks};
+      #if($head=~m#^(\S+)#) {
+      #  die "Head glyphem identifier does not equal file name in '$fullfile' ('$1' vs. '$gly')" unless $1 eq $gly
+      #} else {
+      #  die "Malformed head in file $fullfile"
+      #}
+      #$font{$gly}{data} = [map {rowText2data(join '', @$_)} @blocks]
+      # TODO above is old code, below is new code, but not working yet
+      $font{$gly}{data} = loadFile($fullfile);
     }
   }
 }
diff --git a/Manticore/Num/ContinuedFraction.pm b/Manticore/Num/ContinuedFraction.pm
index f6dde0b..cd55c15 100644
--- a/Manticore/Num/ContinuedFraction.pm
+++ b/Manticore/Num/ContinuedFraction.pm
@@ -7,6 +7,7 @@ use warnings;
 
 use Math::BigRat;
 
+### Methods and constructor
 # Approximation object:
 #   {
 #     a => BigRat, this integer
@@ -54,8 +55,39 @@ sub firstk {
   }
 }
 
+# take the common start part, but at most k parts
+sub commonk {
+  my ($self, $other, $k) = @_;
+  if($k <= 0) {
+    return []
+  } else {
+    return [] if $self->{a} != $other->{a};
+    my $c = $self->child();
+    my $d = $other->child();
+    return [$self->{a}] unless defined $c;
+    my $l = $c->commonk($d, $k-1);
+    unshift @$l, $self->{a};
+    return $l
+  }
+}
 
+### Functions
+# list of integers -> bigrat
+sub reconstruct {
+  my $l = shift;
+  my $ret = Math::BigRat->new($l->[-1]);
+  for(reverse (0..$#$l-1)) {
+    $ret = $l->[$_] + 1/$ret
+  }
+  return $ret;
+}
 
-
+# round to bigRat with ContinuedFraction of $steps parts
+sub roundSteps {
+  my ($steps, $x) = @_;
+  my $cf = Manticore::Num::ContinuedFraction->new($x);
+  my $l = $cf->firstk($steps);
+  return reconstruct($l);
+}
 
 1;
diff --git a/tests/testCf.pl b/tests/testCf.pl
index cd5e7c6..5a2b01f 100755
--- a/tests/testCf.pl
+++ b/tests/testCf.pl
@@ -4,21 +4,41 @@ use strict;
 use warnings;
 
 use Math::Trig;
+use Math::BigRat lib => 'GMP';
 use Data::Dumper;
 
 BEGIN {
   push @INC, '..'
 }
 
+use Manticore::Num::Trig;
 use Manticore::Num::ContinuedFraction;
 
-my $pi = Manticore::Num::ContinuedFraction->new(7.25);
+my $pi = Math::BigRat->new(3);
+
+my $poly = 30;
+
+for(1..5) {
+$pi = $pi + Manticore::Num::Trig::proxSin($poly,$pi);
+print "===\ns: $pi\n";
+$pi = Manticore::Num::ContinuedFraction::roundSteps($poly,$pi);
+print "r: $pi\n";
+}
+
+my $pi1 = Manticore::Num::ContinuedFraction->new($pi);
+
+$pi = $pi + Manticore::Num::Trig::proxSin($poly+2,$pi);
+print "===\ns: $pi\n";
+$pi = Manticore::Num::ContinuedFraction::roundSteps($poly,$pi);
+print "r: $pi\n";
+
+my $pi2 = Manticore::Num::ContinuedFraction->new($pi);
 
 #print $pi->child();
 #
 #print Data::Dumper::Dumper($pi);
 
-my $c = $pi->firstk(25);
+my $c = $pi1->commonk($pi2, 25);
 
 print "[[ @$c ]]\n";