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def separator=max(1,vround(1/12x_height)) enddef;
 
 
vardef diaeresis(expr center)=
  generate_diaeresis(center,dot_size,dot_size+1/8w,h,x_height+separator);
enddef;
 
vardef generate_diaeresis(expr center,target_dot_diam,sep,eff_h,base)=
pickup tiny.nib; numeric dot_diam;
dot_diam:=max(tiny.breadth,hround(target_dot_diam));
pos31(dot_diam,0); pos32(dot_diam,90); x31=x32; top y32r=vround(eff_h);
if bot y32l<base: y32l:=min(y32r-eps,base+.5currentbreadth); fi
y31=.5[y32l,y32r];
pos33(dot_diam,0); penpos34(y32r-y32l,90); y33=y34=y31; x33=x34;
if sep>0 : center=.5[x31,x33]; x33-x31=sep;
else:
  y35l=y35r=.5[y31,y32]; z35l=whatever[z21l,z22l]; z35r=whatever[z21r,z22r];
  rt x31r=hround((min(x35l,x35r)-.5currentbreadth)-.05w);
  lft x33l=hround((max(x35l,x35r)+.5currentbreadth)+.05w);
fi
dot(31,32); dot(33,34);
penlabels(31,32,33,34,35);
enddef;
 
vardef generate_universal(expr center)=
x91=center+.15u;x94=center-.15u; 
y91=y94=x_height+1.5separator;
x92=x91+.3univ_acc_breadth*(body_height-x_height);
x93=x91-.3univ_acc_breadth*(body_height-x_height);
y93=y92=y91+univ_acc_breadth*(body_height-x_height);
fill z91--z92--z93--z94--cycle;
enddef;
 
vardef universal(expr center)=
generate_universal(center);
enddef;
 
vardef diaeresis_universal(expr center)=
x91=center; 
y91=x_height+separator+dot_size;
x92=x91+.5univ_acc_breadth*(body_height-x_height);
x93=x91-.5univ_acc_breadth*(body_height-x_height);
y93=y92=y91+.866univ_acc_breadth*(body_height-x_height);
fill z91--z92--z93--cycle;
generate_diaeresis(center,dot_size,
1.3univ_acc_breadth*(body_height-x_height),
.6[h,x_height],
x_height+separator);
enddef;
 
def acute(expr center)=
generate_universal(center);
enddef;
def circumflex(expr center)=
generate_universal(center);
enddef;
def corr_circumflex(expr center,katiallo)=
generate_universal(center);
enddef;
def spirit(expr center)text type =
;
enddef;
def spirit_acute(expr center)text type =
generate_universal(center);
enddef;
def spirit_circumflex(expr center)text type =
generate_universal(center);
enddef;