This corresponds to $FD21 in the ZX Spectrum version.

Used by little boy no. 1 in lessons $E4, $F7, $F8 and $FE; by little boy no. 2 in lessons $F8 and $FF; by little boy no. 4 in lesson $F7; by little boy no. 5 in lessons $E5 and $FE; by little boy no. 7 in lessons $F7 and $FF; by little boy no. 8 in lesson $F9; by little boy no. 9 in lessons $F9 and $FE; by little boy no. 10 in lessons $E6, $F6, $FA and $FE; by little boy no. 11 in lessons $E4, $E5, $E6, $F6, $FA and $FE; and by EINSTEIN in lessons $E4, $E5 and $E6.