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fml=!declosing $formula
fml=!rawmath $fml
cnt=!itemcnt $fml
!if $cnt!=2
 error=bad_formula
 !exit
!endif
!distribute items $fml into xx,yy
t=$[$xx] $[$yy]
!if $xx=$empty or $yy=$empty or NaN isin $t or Inf isin $t
 error=bad_formula
 !exit
!endif