 For example, Germanic (word-initial) *b- corresponds regularly to Latin "*f-", Greek ', Sanskrit ', Slavic, Baltic or Celtic "b-", etc., while Germanic "*f-" corresponds to Latin, Greek, Sanskrit, Slavic and Baltic "p-" and to zero (no initial consonant) in Celtic.The former set goes back to PIE * (faithfully reflected in Sanskrit and modified in various ways elsewhere), and the latter set to PIE *p- (shifted in Germanic, lost in Celtic, but preserved in the other groups mentioned here).One of the more conspicuous present surface correspondences is the English digraph "wh" and the corresponding Latin and Romance digraph "qu", notably found in interrogative words ("wh"-words) such as the five Ws.