|0100 ( -> square root of 49 ) #0031 sqrt BRK @sqrt ( v* -- v* ) DUP2 #0002 LTH2 ?&end DUP2 ,&s STR2 #01 SFT2 sqrt/update &w ( x1* x0* ) NIP2 sqrt/update SWP2k LTH2 ?&w POP2 &end JMP2r &update ( x0* -- x1* ) DUP2 [ LIT2 &s $2 ] OVR2 DIV2 ADD2 #01 SFT2 JMP2r