### Question:
NMEA { public static final boolean isProprietory(CharSequence seq) { return isNMEAOrAIS(seq) && CharSequences.startsWith(seq, "$P"); }  static final CharSequence getPrefix(CharSequence seq); static final CharSequence findMessage(CharSequence seq); static final TalkerId getTalkerId(CharSequence seq); static final MessageType getMessageType(CharSequence seq); static final boolean isProprietory(CharSequence seq); static final boolean isNMEA(CharSequence seq); static final boolean isAIS(CharSequence seq); static final boolean isNMEAOrAIS(CharSequence seq);  }### Answer:
@Test public void testIsProprietary() { assertTrue(NMEA.isProprietory("$PICOA,08,90,TXF,*1F\r\n")); assertFalse(NMEA.isProprietory("!AIVDM,1,1,,A,13HOI:0P0000VOHLCnHQKwvL05Ip,0*23\r\n")); }