'He is a world champion' is written as 'ya, sa, za, ma, ka'. 'World is a family' is written as 'ma, sa, ba, za'. 'Being champion is difficult' is written as 'fa, sa, da, ka'. What are the codes for 'champion' and 'is'?

'champion' is ka and 'is' is sa, found by matching shared words to shared codes.

'is' appears in all three sentences, and sa is the only code common to all three.

Thus 'is' must be sa.

'champion' appears in the first and third sentences, whose shared codes are sa and ka.

Since sa is already 'is', the remaining shared code ka is 'champion'.